tissue = groups of cells and cell products with similar structure and function. there are four 1 o...
TRANSCRIPT
Tissue = Groups of cells and cell products with similar structure and function.
There are four 1o tissues in the body:
1) Epithelium
2) Connective
3) Muscular
4) Nervous
Functions of Epithelial Tissue
1. Physical Protection
2. Regulate Exchange (permeability)
3. Provides Sensation
4. Produce Secretions
Characteristics of Epithelial Tissue
Characteristics of Epithelial Tissue
1. Cellularity – composed mostly of cells.
2. Polarity – sidenedness of tissue.
3. Attachments – physically connected to neighboring cells.
4. Avascular – has no blood supply of its own.
5. Highly Regenerative – replaces itself constantly.
Epithelial Tissue
Tight Junctions
Desmosomes
Specialized apical end
Classification of Epithelia
Cuboidal epithelium - Short cube-shaped hexagonal boxes.
1. Number of cell layers
2. Shape of Exposed (apical) cells
A) Single layer of cells = Simple Epithelium
B) Several layers of cells (more than one) = Stratified Epithelium
Squamous epithelium - Thin and flat.
Columnar epithelium - Taller than it is wide.
Transitional epithelium - Changes shapes (from squamous to cuboidal).
Simple (1 cell layer) Stratified (more than 1 cell layer)
1) Simple Squamous Epithelium
2) Simple Cuboidal Epithelium
3) Simple Columnar Epithelium
4) Pseudostratified Ciliated Columnar Epithelium
5) Stratified Squamous Epithelium
6) Stratified Cuboidal Epithelium
7) Stratified Columnar Epithelium
8) Transitional Epithelium
Classification of Epithelia
Glomerular capsule; Alveolus
Renal tubules; Thecal follicle (thyroid gland)
Stomach, Small and Large Intestines
Trachea, larynx, bronchi
Keratinized = EpidermisNon-keratinized = esophagus, cheek
Ducts of sweat glandsDucts of salivary glands
Male urethra
Urinary bladder, ureter
Simple Squamous Epithelium
Simple
Cuboidal
Epithelium
Simple Columnar Epithelium
Pseudostratified Ciliated Columnar Epithelium
Stratified Squamous Epithelium
Stratified Cuboidal Epithelium
Stratified Columnar Epithelium
Transitional Epithelium
Connective Tissue
Connective Tissue Proper
1) Blood 2) Lymph
Supporting Connective Tissue
Fluid Connective Tissue
1) Loose1) Areolar2) Adipose3) Reticular
2) Dense1) Regular2) Irregular3) Elastic
1) Bone1) Spongy2) Compact
1) Cartilage1) Hyaline2) Elastic3) Fibrocartilage
Areolar Tissue
Adipose Tissue
Reticular Tissue
Dense Regular Connective Tissue
Dense Irregular Connective Tissue
Elastic Tissue
Hyaline Cartilage
Elastic Cartilage
Fibrocartilage
Bone Tissue
Compact BoneSpongy Bone
Hematopoietic stem cells produce blood and lymph cells
Fluid Connective Tissue