tissues aim: how does the tissue level impact homeostasis?
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TissuesTissues
Aim: How does the tissue Aim: How does the tissue level impact homeostasis?level impact homeostasis?
TissuesTissues
Cells work together in functionally Cells work together in functionally related groups called tissuesrelated groups called tissues
How is this done?How is this done? AttachmentsAttachments communicationcommunication
Types of tissues:Types of tissues:1.1. Epithelial – lining and coveringEpithelial – lining and covering2.2. Connective – support Connective – support 3.3. Muscle – movementMuscle – movement4.4. Nervous – controlNervous – control
Lateral Surface FeaturesLateral Surface Features
Factors holding epithelial cells Factors holding epithelial cells togethertogether Adhesion proteins link plasma Adhesion proteins link plasma
membranes of adjacent cellsmembranes of adjacent cells Contours of adjacent cell membranes Contours of adjacent cell membranes Special cell junctionsSpecial cell junctions
Lateral Surface Features Lateral Surface Features – Cell Junctions– Cell Junctions
Tight junctions (zona occludens) – Tight junctions (zona occludens) – close off intercellular space close off intercellular space Found at apical region of most Found at apical region of most
epithelial typesepithelial types Some proteins in plasma membrane of Some proteins in plasma membrane of
adjacent cells are fusedadjacent cells are fused Prevent molecules from passing Prevent molecules from passing
between cells of epithelial tissuebetween cells of epithelial tissue
Tight JunctionTight Junction
Lateral Surface Features – Lateral Surface Features – Cell JunctionsCell Junctions
Adherens junctions (zonula Adherens junctions (zonula adherens) – anchoring junctionadherens) – anchoring junction Transmembrane linker proteins attach Transmembrane linker proteins attach
to actin microfilaments of the to actin microfilaments of the cytoskeleton and bind adjacent cellscytoskeleton and bind adjacent cells
Along with tight junctions, form the Along with tight junctions, form the tight junctional complex around apical tight junctional complex around apical lateral borders of epithelial tissueslateral borders of epithelial tissues
Zonula Adherens (Belt Zonula Adherens (Belt Desmosome)Desmosome)
Lateral Surface Features Lateral Surface Features – Cell Junctions– Cell Junctions
Desmosomes (macula adherens) – Desmosomes (macula adherens) – two disc-like plaques connected two disc-like plaques connected across intercellular spaceacross intercellular space Plaques of adjoining cells are joined by Plaques of adjoining cells are joined by
proteins called cadherins proteins called cadherins Proteins interdigitate into extra-Proteins interdigitate into extra-
cellular spacecellular space Intermediate filaments insert into Intermediate filaments insert into
plaques from cytoplasmic sideplaques from cytoplasmic side
CDH1 - E-cadherin (epithelial) CDH2 - N-cadherin (neural) CDH12 - cadherin 12, type 2 (N-cadherin 2) CDH3 - P-cadherin (placental) CDH4 - R-cadherin (retinal) CDH5 - VE-cadherin (vascular endothelial) CDH6 - K-cadherin (kidney) CDH7 - cadherin 7, type 2 CDH8 - cadherin 8, type 2 CDH9 - cadherin 9, type 2 (T1-cadherin) CDH10 - cadherin 10, type 2 (T2-cadherin) CDH11 - OB-cadherin (osteoblast) CDH13 - T-cadherin - H-cadherin (heart) CDH15 - M-cadherin (myotubule) CDH16 - KSP-cadherin CDH17 - LI cadherin (liver-intestine) CDH18 - cadherin 18, type 2 CDH19 - cadherin 19, type 2 CDH20 - cadherin 20, type 2 CDH23 - cadherin 23, (neurosensory epithelium)
DesmosomeDesmosome
Figure 4.7b
Desmosome DetailDesmosome Detail
Lateral Surface Features Lateral Surface Features – Cell Junctions– Cell Junctions
Gap junctions – passageway between Gap junctions – passageway between two adjacent cellstwo adjacent cells Let small molecules move directly Let small molecules move directly
between neighboring cellsbetween neighboring cells Cells are connected by hollow cylinders Cells are connected by hollow cylinders
of proteinof protein
Gap JunctionGap Junction
Figure 4.7c
Aim: How do epithelial Aim: How do epithelial tissues differ?tissues differ?
Epithelial Tissue – Epithelial Tissue – General Characteristics & General Characteristics &
FunctionsFunctions Covers a body surface or lines a Covers a body surface or lines a
body cavity body cavity Forms most glandsForms most glands Functions of epitheliumFunctions of epithelium
ProtectionProtection Absorption, secretion, and ion transportAbsorption, secretion, and ion transport FiltrationFiltration Forms slippery surfacesForms slippery surfaces
Special Characteristics Special Characteristics of Epitheliaof Epithelia
CellularityCellularity cells are in close contact with each other with little or no cells are in close contact with each other with little or no
intercellular space between themintercellular space between them Specialized contactsSpecialized contacts
may have junctions for both attachment and may have junctions for both attachment and communicationcommunication
PolarityPolarity epithelial tissues always have an apical and basal surfaceepithelial tissues always have an apical and basal surface
Support by connective tissue Support by connective tissue at the basal surface, both the epithelial tissue and the at the basal surface, both the epithelial tissue and the
connective tissue contribute to the basement membraneconnective tissue contribute to the basement membrane AvascularAvascular
nutrients must diffusenutrients must diffuse InnervatedInnervated Regenerative Regenerative
epithelial tissues have a high capacity for regenerationepithelial tissues have a high capacity for regeneration
Special Characteristics Special Characteristics of Epitheliaof Epithelia
First name of tissue indicates First name of tissue indicates number of layersnumber of layers Simple – one layer of cellsSimple – one layer of cells
Stratified – more than one layer of cellsStratified – more than one layer of cells
Classifications of Classifications of EpitheliaEpithelia
Classifications of Classifications of EpitheliaEpithelia
Last name of tissue describes shape Last name of tissue describes shape of cellsof cells Squamous – cells wider than Squamous – cells wider than
tall (plate or “scale” like)tall (plate or “scale” like)
Cuboidal – cells are as wide as Cuboidal – cells are as wide as tall, as in cubestall, as in cubes
Columnar – cells are taller thanColumnar – cells are taller than they are wide, like columns they are wide, like columns
Naming EpitheliaNaming Epithelia Naming the epithelia includes both the layers Naming the epithelia includes both the layers
(first) and the shape of the cells (second)(first) and the shape of the cells (second) i.e. stratified cuboidal epitheliumi.e. stratified cuboidal epithelium
The name may also include any accessory The name may also include any accessory structuresstructures Goblet cellsGoblet cells CiliaCilia KeratinKeratin
Special epithelial tissues (don’t follow naming Special epithelial tissues (don’t follow naming convention)convention) PsuedostratifiedPsuedostratified TransitionalTransitional
Simple Squamous Simple Squamous EpitheliumEpithelium
Description Description single layer of flat cells with disc-shaped single layer of flat cells with disc-shaped
nucleinuclei Special types Special types
Endothelium (inner covering) Endothelium (inner covering) slick lining of hollow organsslick lining of hollow organs
Mesothelium (middle covering) Mesothelium (middle covering) Lines peritoneal, pleural, and pericardial Lines peritoneal, pleural, and pericardial
cavities cavities Covers visceral organs of those cavitiesCovers visceral organs of those cavities
Simple Squamous Simple Squamous EpitheliumEpithelium
Function Function Passage of materials by passive diffusion and Passage of materials by passive diffusion and
filtrationfiltration Secretes lubricating substances in serous Secretes lubricating substances in serous
membranesmembranes
Location Location Renal corpusclesRenal corpuscles Alveoli of lungs Alveoli of lungs Lining of heart, blood and lymphatic vesselsLining of heart, blood and lymphatic vessels Lining of ventral body cavity (serosae/serous Lining of ventral body cavity (serosae/serous
memb.) memb.)
Simple Squamous Simple Squamous EpitheliumEpithelium
Simple squamous
lining the walls of the capillary
If it’s from a mesothelial lining
Aim: How do epithelial Aim: How do epithelial tissues differ? Day 2tissues differ? Day 2
Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Classification of Classification of EpitheliaEpithelia
1 2 3
1 2 3
?
Simple Cuboidal Simple Cuboidal EpitheliumEpithelium
DescriptionDescription single layer of cube-like cells with large, single layer of cube-like cells with large,
spherical central nucleispherical central nuclei Function Function
secretion and absorptionsecretion and absorption Location Location
kidney tubules, secretory portions of small kidney tubules, secretory portions of small glands, ovary surfaceglands, ovary surface
Simple Cuboidal Simple Cuboidal EpitheliumEpithelium
Simple Columnar Simple Columnar EpitheliumEpithelium
Description Description single layer of column-shaped single layer of column-shaped
(rectangular) cells with oval nuclei(rectangular) cells with oval nuclei Some bear cilia at their apical surfaceSome bear cilia at their apical surface May contain goblet cellsMay contain goblet cells
Function Function Absorption; secretion of mucus, Absorption; secretion of mucus,
enzymes, and other substancesenzymes, and other substances Ciliated type propels mucus or Ciliated type propels mucus or
reproductive cells by ciliary actionreproductive cells by ciliary action
Simple Columnar Simple Columnar EpitheliumEpithelium
Location Location Non-ciliated form Non-ciliated form
Lines digestive tract, gallbladder, ducts of Lines digestive tract, gallbladder, ducts of some glandssome glands
Ciliated form Ciliated form Lines small bronchi, Lines small bronchi,
uterine tubes, and uterusuterine tubes, and uterus
Pseudostratified Pseudostratified Columnar EpitheliumColumnar Epithelium
DescriptionDescription All cells originate at basement membraneAll cells originate at basement membrane Only tall cells reach the apical surfaceOnly tall cells reach the apical surface May contain goblet cells and bear ciliaMay contain goblet cells and bear cilia Nuclei lie at varying heights within cellsNuclei lie at varying heights within cells
Gives false impression of stratificationGives false impression of stratification
Function Function secretion of mucus; propulsion of mucus secretion of mucus; propulsion of mucus
by ciliaby cilia
Pseudostratified Pseudostratified Columnar EpitheliumColumnar Epithelium
LocationsLocations Non-ciliated type Non-ciliated type
Ducts of male Ducts of male reproductive tubes reproductive tubes
Ducts of large Ducts of large glandsglands
Ciliated variety Ciliated variety Lines trachea and Lines trachea and
most of upper most of upper respiratory tractrespiratory tract
Aim: How do epithelial Aim: How do epithelial tissues differ? Day 3tissues differ? Day 3
Epithelial tissue has several distinctive properties. Which correctly lists these
properties?
1. Avascular and cellularity
2. Polarity and regeneration
3. Contractility and excitability
4. 1 and 2
Which of the following is NOT a characteristic of epithelial tissue?
1. It is composed entirely of cells.
2. It stores energy reserves.
3. It is avascular.
4. It is capable of regeneration.
An epithelial surface bears many microvilli. What is the probable function
of this epithelium?
1. absorption
2. secretion
3. transportation
4. sensation
What is the functional significance of gap junctions?
1. They maintain water-tight passages.
2. They resist stretching and twisting.
3. They share ions between adjacent cells
4. They attach cells to extracellular matrix.
Stratified EpitheliaStratified Epithelia
Contain two or more layers of cellsContain two or more layers of cells Regenerate from belowRegenerate from below Major role is protectionMajor role is protection Are named according to the Are named according to the shape of shape of
cells at apical layercells at apical layer
Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Classification of Classification of EpitheliaEpithelia
1 2 3
1 2 3
?
Stratified Squamous Stratified Squamous EpitheliumEpithelium
DescriptionDescription Many layers of cells – squamous in Many layers of cells – squamous in
shapeshape Deeper layers of cells appear cuboidal Deeper layers of cells appear cuboidal
or columnar or columnar Thickest epithelial tissue – adapted for Thickest epithelial tissue – adapted for
protectionprotection
Stratified Squamous Stratified Squamous EpitheliumEpithelium
Specific types Specific types KeratinizedKeratinized – contain the protective protein keratin – contain the protective protein keratin
Surface cells are dead and full of keratin Surface cells are dead and full of keratin Non-keratinizedNon-keratinized – forms moist lining of body – forms moist lining of body
openingsopenings FunctionFunction
Protects underlying tissues in areas subject to Protects underlying tissues in areas subject to abrasionabrasion
Location Location Keratinized – forms epidermisKeratinized – forms epidermis Non-keratinized – forms lining of esophagus, Non-keratinized – forms lining of esophagus,
mouth, and vaginamouth, and vagina
Stratified Squamous Stratified Squamous EpitheliumEpithelium
Non-keratinized vs. Keratinized
Stratified Cuboidal Stratified Cuboidal EpitheliumEpithelium
DescriptionDescription generally two generally two
layers of cube-layers of cube-shaped cellsshaped cells
FunctionFunction protectionprotection
LocationLocation Forms largest Forms largest
ducts of sweat ducts of sweat glandsglands
Forms ducts of Forms ducts of mammary glands mammary glands and salivary glandsand salivary glands
Stratified Columnar Stratified Columnar EpitheliumEpithelium
DescriptionDescription several layers; basal several layers; basal
cells usually cells usually cuboidal; superficial cuboidal; superficial cells elongatedcells elongated
FunctionFunction protection and protection and
secretionsecretion Location Location
Rare tissue typeRare tissue type Found in male Found in male
urethra and vas urethra and vas deferens, largest deferens, largest ducts of salivary ducts of salivary glands, nasopharynxglands, nasopharynx
Transitional EpitheliumTransitional Epithelium
Description Description Basal cells usually cuboidal or columnarBasal cells usually cuboidal or columnar Superficial cells dome-shaped or squamousSuperficial cells dome-shaped or squamous
FunctionFunction stretches and permits distension of urinary stretches and permits distension of urinary
bladderbladder Location Location
Lines ureters, urinary bladder and part of Lines ureters, urinary bladder and part of urethra urethra
Transitional EpitheliumTransitional EpitheliumRelaxed state
Stretched state
Glandular EpitheliumGlandular Epithelium Ducts carry products of exocrine Ducts carry products of exocrine
glands to epithelial surfaceglands to epithelial surface Include the following diverse glands Include the following diverse glands
Mucus-secreting glands Mucus-secreting glands Sweat and oil glandsSweat and oil glands Salivary glandsSalivary glands Liver and pancreasLiver and pancreas
May be: unicellular or multicellularMay be: unicellular or multicellular
Unicellular Exocrine Unicellular Exocrine Glands Glands
(The Goblet Cell)(The Goblet Cell) Goblet cells Goblet cells
produce mucin produce mucin Mucin + water Mucin + water
mucusmucus Protects and Protects and
lubricates many lubricates many internal body internal body surfacessurfaces
Multicellular Exocrine Multicellular Exocrine GlandsGlands
Have two basic partsHave two basic parts Epithelium-walled ductEpithelium-walled duct Secretory unitSecretory unit
Classified by structure of ductClassified by structure of duct SimpleSimple CompoundCompound
Categorized by secretory unitCategorized by secretory unit TubularTubular AlveolarAlveolar TubuloalveolarTubuloalveolar
Types of Multicellular Types of Multicellular Exocrine GlandsExocrine Glands
Exocrine Vs. Endocrine Exocrine Vs. Endocrine GlandsGlands
Endocrine Gland Characteristics:Endocrine Gland Characteristics: Ductless glandsDuctless glands Secrete substances directly into Secrete substances directly into
bloodstream bloodstream Produce molecules called hormonesProduce molecules called hormones
Which is Which?
Basal Feature: The Basal Basal Feature: The Basal LaminaLamina
Noncellular supporting sheet between the Noncellular supporting sheet between the epithelium and the connective tissue deep to it epithelium and the connective tissue deep to it
Consists of proteins secreted by the epithelial cells Consists of proteins secreted by the epithelial cells Functions:Functions:
Acts as a selective filter, determining which molecules Acts as a selective filter, determining which molecules from capillaries enter the epithelium from capillaries enter the epithelium
Acts as scaffolding along which regenerating epithelial Acts as scaffolding along which regenerating epithelial cells can migrate cells can migrate
Basal lamina and reticular layers of the underlying Basal lamina and reticular layers of the underlying connective tissue form the basement membraneconnective tissue form the basement membrane
Hemidesmosomal junctions… holding it Hemidesmosomal junctions… holding it all down!all down!
Epithelial Surface Epithelial Surface FeaturesFeatures
Apical surface features Apical surface features Microvilli – finger-like extensions of Microvilli – finger-like extensions of
plasma membraneplasma membrane Abundant in epithelia of small intestine Abundant in epithelia of small intestine
and kidneyand kidney Maximize surface area across which Maximize surface area across which
small molecules enter or leavesmall molecules enter or leave Act as stiff knobs that resist abrasionAct as stiff knobs that resist abrasion
Epithelial Surface Epithelial Surface FeaturesFeatures
Apical surface featuresApical surface features Cilia – whip-like, highly motile Cilia – whip-like, highly motile
extensions of apical surface membranesextensions of apical surface membranes Contains a core of nine pairs of Contains a core of nine pairs of
microtubules encircling one middle pairmicrotubules encircling one middle pair Axoneme – a set of microtubulesAxoneme – a set of microtubules Each pair of microtubules – arranged in a Each pair of microtubules – arranged in a
doublet doublet Microtubules in cilia – arranged similarly to Microtubules in cilia – arranged similarly to
cytoplasmic organelles called centriolescytoplasmic organelles called centrioles Movement of cilia – in coordinated wavesMovement of cilia – in coordinated waves
A CiliumA Cilium
The secretory cells of sebaceous glands fill with secretions and then rupture, releasing their
contents. Which type of secretion is this?
1. acinar
2. apocrine
3. merocrine
4. holocrine
Milk production in mammary glands involves a combination of which two types
of secretion?
1. Apocrine and serous
2. Holocrine and merocrine
3. Mucous and exocrine
4. Apocrine and merocrine
Simple branched tubular glands are characteristic of which examples of glands?
1. Sweat glands and mammary glands
2. Gastric glands and mucous glands of esophagus
3. Salivary glands and pancreas
4. Bulbourethral glands and seminiferous tubules
The singular example of a unicellular exocrine gland is the ________?
1. Sweat gland
2. Intestinal gland
3. Goblet cell
4. Not found in adult
A gland has no ducts to carry the glandular secretions, and the gland’s secretions are released directly into the
extracellular fluid. Which type of gland is this?
1. exocrine gland
2. endocrine gland
3. acinar gland
4. tubular gland
Aim: How do connective Aim: How do connective tissues differ?tissues differ?
Connective TissueConnective Tissue Most diverse and abundant tissueMost diverse and abundant tissue Main classesMain classes
Connective tissue properConnective tissue proper CartilageCartilage Bone tissueBone tissue BloodBlood
Components of connective tissue:Components of connective tissue: Cells (varies according to tissue)Cells (varies according to tissue) MatrixMatrix
Fibers (varies according to tissue)Fibers (varies according to tissue) Ground substance (varies according to tissue)Ground substance (varies according to tissue)
dermatin sulfate, hyaluronic acid, keratin sulfate, dermatin sulfate, hyaluronic acid, keratin sulfate, chondroitin sulfate…chondroitin sulfate…
Common embryonic origin – Common embryonic origin – mesenchymemesenchyme
Classes of Connective Classes of Connective TissueTissue
Connective Tissue Model Connective Tissue Model Areolar connective tissueAreolar connective tissue
Underlies epithelial tissueUnderlies epithelial tissue Surrounds small nerves and blood vesselsSurrounds small nerves and blood vessels Has structures and functions shared by other Has structures and functions shared by other
connective tissues connective tissues Borders all other tissues in the body Borders all other tissues in the body
Structures within areolar connective tissue Structures within areolar connective tissue allow:allow: Support and binding of other tissuesSupport and binding of other tissues Holding body fluidsHolding body fluids Defending body against infectionDefending body against infection Storing nutrients as fatStoring nutrients as fat
Connective Tissue ProperConnective Tissue Proper Loose Connective TissueLoose Connective Tissue
AreolarAreolar ReticularReticular AdiposeAdipose
Dense Connective Dense Connective TissueTissue RegularRegular IrregularIrregular ElasticElastic
Areolar Connective Areolar Connective TissueTissue Description Description
Gel-like matrix with:Gel-like matrix with: all three fiber types (collagen, reticular, elastic) for supportall three fiber types (collagen, reticular, elastic) for support Ground substance is made up by glycoproteins also made and Ground substance is made up by glycoproteins also made and
screted by the fibroblasts.screted by the fibroblasts. Cells – fibroblasts, macrophages, mast cells, white blood Cells – fibroblasts, macrophages, mast cells, white blood
cellscells Function Function
Wraps and cushions organsWraps and cushions organs Holds and conveys tissue fluidHolds and conveys tissue fluid Important role in inflammation Main battlefield in fight Important role in inflammation Main battlefield in fight
against infectionagainst infection Defenders gather at infection sitesDefenders gather at infection sites
MacrophagesMacrophages Plasma cellsPlasma cells Mast cellsMast cells Neutrophils, lymphocytes, and eosinophilsNeutrophils, lymphocytes, and eosinophils
Areolar Connective Areolar Connective TissueTissue
Location Location Widely distributed under epitheliaWidely distributed under epithelia Packages organsPackages organs Surrounds capillariesSurrounds capillaries
Adipose TissueAdipose Tissue Description Description
Closely packed adipocytes Closely packed adipocytes Have nucleus pushed to Have nucleus pushed to
one side by fat droplet one side by fat droplet FunctionFunction
Provides reserve food fuelProvides reserve food fuel Insulates against heat Insulates against heat
lossloss Supports and protects Supports and protects
organsorgans LocationLocation
Under skin Under skin Around kidneys Around kidneys Behind eyeballs, within Behind eyeballs, within
abdomen and in breastsabdomen and in breasts
Reticular Connective Reticular Connective TissueTissue
Description – Description – network of reticular network of reticular fibers in loose ground fibers in loose ground substancesubstance
Function – form a Function – form a soft, internal skeleton soft, internal skeleton (stroma) – supports (stroma) – supports other cell typesother cell types
Location – lymphoid Location – lymphoid organs organs Lymph nodes, bone Lymph nodes, bone
marrow, and spleenmarrow, and spleen
Dense Irregular Dense Irregular Connective TissueConnective Tissue
Description Description Primarily Primarily irregularlyirregularly
arranged collagen fibersarranged collagen fibers Some elastic fibers and Some elastic fibers and
fibroblastsfibroblasts Function Function
Withstands tensionWithstands tension Provides structural Provides structural
strength strength LocationLocation
Dermis of skinDermis of skin Submucosa of digestive Submucosa of digestive
tracttract Fibrous capsules of joints Fibrous capsules of joints
and organsand organs
Dense Regular Dense Regular Connective TissueConnective Tissue DescriptionDescription
Primarily Primarily parallelparallel collagen fibers collagen fibers Fibroblasts and some elastic fibersFibroblasts and some elastic fibers Poorly vascularizedPoorly vascularized
FunctionFunction Attaches muscle to boneAttaches muscle to bone Attaches bone to boneAttaches bone to bone Withstands great stress in Withstands great stress in
one directionone direction LocationLocation
Tendons and ligamentsTendons and ligaments Aponeuroses Aponeuroses Fascia around musclesFascia around muscles
CartilageCartilage Characteristics:Characteristics:
Firm, flexible tissueFirm, flexible tissue Contains no blood vessels or nervesContains no blood vessels or nerves Matrix contains up to 80% waterMatrix contains up to 80% water Cell type – chondrocyte Cell type – chondrocyte
Types:Types: HyalineHyaline ElasticElastic FibrocartilageFibrocartilage
Hyaline CartilageHyaline Cartilage
DescriptionDescription Imperceptible collagen fibers (hyaline = Imperceptible collagen fibers (hyaline =
glassy)glassy) Chodroblasts produce matrixChodroblasts produce matrix Chondrocytes lie in lacunae Chondrocytes lie in lacunae
FunctionFunction Supports and reinforcesSupports and reinforces Resilient cushionResilient cushion Resists repetitive stressResists repetitive stress
Hyaline CartilageHyaline Cartilage
LocationLocation Fetal skeletonFetal skeleton Ends of long bonesEnds of long bones Costal cartilage of ribsCostal cartilage of ribs Cartilages of nose, Cartilages of nose,
trachea, and larynxtrachea, and larynx
Elastic CartilageElastic Cartilage DescriptionDescription
Similar to hyaline cartilageSimilar to hyaline cartilage More elastic fibers in matrixMore elastic fibers in matrix
Function Function Maintains shape of structureMaintains shape of structure Allows great flexibilityAllows great flexibility
LocationLocation Supports external earSupports external ear EpiglottisEpiglottis
FibrocartilageFibrocartilage DescriptionDescription
Matrix similar, but less firm than hyaline Matrix similar, but less firm than hyaline cartilagecartilage
Thick collagen fibers predominateThick collagen fibers predominate FunctionFunction
Tensile strength and ability Tensile strength and ability to absorb compressive to absorb compressive shockshock
LocationLocation Intervertebral discsIntervertebral discs Pubic symphysisPubic symphysis Discs of knee jointDiscs of knee joint
Bone TissueBone Tissue FunctionFunction
Supports and Supports and protects organsprotects organs
Provides levers and Provides levers and attachment site for attachment site for musclesmuscles
Stores calcium and Stores calcium and other mineralsother minerals
Stores fatStores fat Marrow is site for Marrow is site for
blood cell formationblood cell formation Location Location
BonesBones
Blood TissueBlood Tissue DescriptionDescription
red and white blood cells red and white blood cells in a fluid matrixin a fluid matrix
FunctionFunction transport of respiratory transport of respiratory
gases, nutrients, and wastesgases, nutrients, and wastes LocationLocation
within blood vesselswithin blood vessels CharacteristicsCharacteristics
An atypical connective tissueAn atypical connective tissue Develops from mesenchymeDevelops from mesenchyme Consists of cells surrounded by nonliving matrixConsists of cells surrounded by nonliving matrix
Mesenchyme connective tissue gives rise to which tissue type(s)?
1. Stratified epithelial tissues
2. Smooth and cardiac muscle tissues
3. All nervous tissue
4. All connective tissues
Lack of vitamin C in the diet interferes with the ability of fibroblasts to produce collagen. What
effect might this interference have on connective tissue?
1. Tissue is unable to phagocytize.
2. Tissue is unable to produce melanin.
3. Tissue is weak and prone to damage.
4. Tissue is unable to produce heparin.
Brown fat is functionally and structurally different from white fat in
which ways?
1. It is highly vascularized and contains numerous mitochondria
2. It does not capture energy that is released
3. It generates heat, which warms blood
4. All of the above are correct
Many allergy sufferers take antihistamines to relieve their allergy symptoms. Which type of cell
produces the molecule that this medication blocks?
1. eosinophils
2. mast cells
3. basophils
4. 2 and 3
Connective tissues share three basic components. Which of the following
lists these components?
1. Specialized cells, extracellular fibers, and ground substance
2. Mast cells, adipocytes, and mesenchymal cells
3. Macrophages, elastic fibers, and collagen fibers
4. None of these is correct
Which type of connective tissue contains primarily triglycerides?
1. areolar
2. adipose
3. reticular
4. mesenchyme
Why does cartilage heal so slowly?
1. It lacks a direct blood supply, necessary for proper healing.
2. Chondroitin sulfate prevents healing.
3. Matrix inhibits cellular regeneration.
4. Interstitial fluid, necessary for proper healing, is excluded.
If a person has a herniated intervertebral disc, which type of cartilage has been
damaged?
1. elastic cartilage
2. fibrocartilage
3. hyaline cartilage
4. areolar cartilage
Which two types of connective tissue have a fluid matrix?
1. lymph and cartilage
2. cartilage and bone
3. blood and bone
4. blood and lymph
Which types of connective tissue are classified as supporting connective
tissue and why?
1. Adipose and dense regular connective tissue/they are connective tissue proper
2. Muscle and blood/they have the highest need for oxygen
3. Bone and cartilage/form framework of body
4. 2 and 3
Covering and Lining Covering and Lining MembranesMembranes
Combine epithelial tissues and Combine epithelial tissues and connective tissuesconnective tissues
Cover broad areas within bodyCover broad areas within body Consist of epithelial sheet plus Consist of epithelial sheet plus
underlying connective tissueunderlying connective tissue
Three Types of Three Types of MembranesMembranes
Cutaneous membrane – skin Cutaneous membrane – skin Mucous membrane Mucous membrane
Lines hollow organs that open to surface of Lines hollow organs that open to surface of bodybody
An epithelial sheet underlain with layer of An epithelial sheet underlain with layer of lamina propria lamina propria
Serous membrane – slippery membranesSerous membrane – slippery membranes Simple squamous epithelium lying on Simple squamous epithelium lying on
areolar connective tissueareolar connective tissue Line closed cavitiesLine closed cavities
Pleural, peritoneal, and pericardial cavitiesPleural, peritoneal, and pericardial cavities
Covering and Lining Covering and Lining MembranesMembranes
Covering and Lining Covering and Lining MembranesMembranes
Muscle TissueMuscle Tissue
TypesTypes Skeletal muscle tissueSkeletal muscle tissue Cardiac muscle tissue Cardiac muscle tissue Smooth muscle tissueSmooth muscle tissue
Skeletal Muscle TissueSkeletal Muscle Tissue CharacteristicsCharacteristics
Long, cylindrical cellsLong, cylindrical cells MultinucleateMultinucleate Obvious striationsObvious striations
Function Function Voluntary movementVoluntary movement Manipulation of Manipulation of
environmentenvironment Facial expressionFacial expression
LocationLocation Skeletal muscles attached to bones Skeletal muscles attached to bones
(occasionally to skin)(occasionally to skin)
Cardiac Muscle TissueCardiac Muscle Tissue
FunctionFunction Contracts to propel blood into circulatory Contracts to propel blood into circulatory
systemsystem CharacteristicsCharacteristics
Branching cellsBranching cells UninucleateUninucleate Intercalated discsIntercalated discs
LocationLocation Occurs in walls of heartOccurs in walls of heart
Smooth Muscle TissueSmooth Muscle Tissue CharacteristicsCharacteristics
Spindle-shaped cells withSpindle-shaped cells withcentral nucleicentral nuclei
Arranged closely to form Arranged closely to form sheetssheets
No striationsNo striations FunctionFunction
Propels substances along Propels substances along internal passagewaysinternal passageways
Involuntary controlInvoluntary control LocationLocation
Mostly walls of hollow organsMostly walls of hollow organs
Nervous TissueNervous Tissue FunctionFunction
Transmit electrical signals Transmit electrical signals from sensory receptors to from sensory receptors to effectorseffectors
LocationLocation Brain, spinal cord, and nervesBrain, spinal cord, and nerves
DescriptionDescription Main components are brain, Main components are brain,
spinal cord, and nervesspinal cord, and nerves Contains two types of cellsContains two types of cells
Neurons – excitatory cellsNeurons – excitatory cells Supporting cells (neuroglial cells) Supporting cells (neuroglial cells)
Tissue Response to Tissue Response to InjuryInjury
Inflammatory response – non-Inflammatory response – non-specific, local responsespecific, local response Limits damage to injury siteLimits damage to injury site
Immune response – takes longer to Immune response – takes longer to develop and very specificdevelop and very specific Destroys particular microorganisms at Destroys particular microorganisms at
site of infectionsite of infection
The Tissues Throughout The Tissues Throughout LifeLife
At the end of second month of development:At the end of second month of development: Primary tissue types have appearedPrimary tissue types have appeared Major organs are in placeMajor organs are in place
AdulthoodAdulthood Only a few tissues regenerateOnly a few tissues regenerate Many tissues still retain populations of stem cellsMany tissues still retain populations of stem cells
With increasing age:With increasing age: Epithelia thin Epithelia thin Collagen decreasesCollagen decreases Bones, muscles, and nervous tissue begin to Bones, muscles, and nervous tissue begin to
atrophyatrophy Poor nutrition and poor circulation – poor health of Poor nutrition and poor circulation – poor health of
tissuestissues
Which cavities in the body are lined by serous membranes?
1. cranial and abdominal
2. pleural, peritoneal, and pericardial
3. synovial and fascial
4. nasal, urinary and reproductive
Serous membranes contrast mucous membranes in what way?
1. Mucous membranes line passageways that open to the exterior/serous membranes line
sealed internal subdivisions of the body cavity
2. Serous membranes line passageways that open to the exterior/mucous membranes line
sealed internal subdivisions of the body cavity
3. Serous membranes are parietal/mucous membranes are visceral
4. Serous membranes secrete mucous/mucous membranes secrete transudate
Which type of muscle tissue has small, tapering cells with single nuclei and no
obvious striations?
1. skeletal
2. cardiac
3. smooth
4. all of the above
A tissue contains irregularly shaped cells with many fibrous projections, some several
centimeters long. These are probably which type of cell?
1. neuroglia
2. neurons
3. myocytes
4. adipocytes
If skeletal muscle cells in adults are incapable of dividing, how is new skeletal muscle
formed?
1. through the enlarging and splitting of existing cells
2. through the atrophy of existing cells
3. through the addition of new striations
4. through the division and fusion of satellite cells
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