integumentary system chapter 5. lesson 1 primary structures of the skin

Integumentary SystemChapter 5

Lesson 1Primary structures of the skin

Do Now

Read pg 93 Medical Focus: Body Art and answer the following questions:

What is tattooing?

Discuss two complications that can come from tattooing and piercing.

What two things can happen if a persons skin reacts to the ink?

Name 3 safety tips when getting pierced or tattooed.

Skin

Structure

Cutaneous membrane

Adults: 20.83 sq feet

Largest organ in the body

4 types of tissue: epithelial, connective, muscular, nervous

Epidermis = outer

Dermis = inner

Hypodermis = between skin and structures

EpidermisStructure

Outer

Thin

Epithelial tissue

No blood vessels

Tightly packed cells

3 layers

Stratum corneum

Stratum lucidum

Stratum basale

Stratum Corneum

Most superficial

WaterproofProtects from water loss/gain

Keratin (protein)

Protects from invaders

Stratum Lucidum

Protection from friction

Found in thick skinHands, feet elbows

Stratum Basale

Deepest layer

Produces new cells

Uses sensory nerves

Pain receptors send messages to the brain

Dermis

Inferior to epidermis

Dense connective tissue

Thick layer

Collagen and elastic fibers

Flexible

Blood vessels

Dermal Papillae: fingerlike tissue which anchors the dermis to the epidermis

Hypodermis

Below dermis

Between dermis and body structures (bones, tendons, muscles)

Loose connective tissue

Fat

Insulates body

Excess = obesity

Content Check

The deepest layer of the epidermis is the ____________________

Blood vessels can be found in:a) all 3 layers of skin

b) the dermis only

c) the hypodermis and dermis

Stratum basale

In class assignment

Read pg. 92 “I.C.E. – In Case of Emergency”

What is a first responders role in treating burns?What is the “rule of nines”What does “ABC” Stand for?Describe the difference between 1st, 2nd, and 3rd degree burns.What are the major complications of burns?

Hand in when done

Homework

Text pg. 96 “Study Questions” # 1-4

Lesson 2Analyzing fingerprints

Types of Fingerprints

Compare your fingerprints to these three types to see what kind you have!

Lesson 3Accessory structures

Do Now

Hand in Anatomy in the News!

Pluck a strand of hair from your own head.

Describe the following:Color

Texture

Density

Flexibility

Strength

HairAccessory structure

Epithelial tissue

Fine and downy except on head

Found on all body parts except: palms, soles, lips, nipples, external reproductive organs

Structure of hair

Oil gland

Sebaceous glands

Smooth muscleErrector pilli allows hair to stand on end

Hair Follicles

Located in the dermis

Divide rapidly producing new hair cells

As hair is pushed away less nutrients are received

Root = within the follicle

Shaft = beyond the skin

Nails

Accessory structure

Epithelial tissue

Nail root: divides to push out new nail

Cuticle: large amount of cell division

Vascularized creates pink color of unpainted nails

Hair & Nails

Content Check

Which part of the hair contains actively growing cells?

a) base of hair follicle

b) hair root

c) hair shaft

In class assignment

Skin coloring worksheet

Homework

Text pg. 96 “Study Questions” #5

Lesson 4Hair

In class assignment

Analyze hair samples

Lesson 5Glands and Homeostasis

Do Now

What do glands do?

GlandsFunctions

Specialized groups of cells that produce and secrete substances into ducts

Types

Sweat glands

Sebaceous glands

Mammary glands

Sweat Glands

Present in all regions of the skin

Most glands are found in the palms and soles

Why?

Become active when under stressWhat is stress? What causes stress?

Use exocytosis to release sweatWhat is exocytosis?

Apocrine Glands

Type of sweat gland

Open onto hair follicles

Found in armpits, groin, anus

Become active at puberty

Act as an attractant to the opposite sex

Eccrine Glands

Type of sweat gland

Open to the surface of the skin

Become active when hot

Lower body temperature

EXCRETE salts, urea, waterWhat is excretion?

Sebaceous Glands

Associated with hair follicles

Lubricates skin and hair

Makes skin waterproof

Kills bacteria

Secrete oils called sebum

If you don’t release sebum the glands become inflammed and cause acne

How can this be prevented or treated?

Mammary Glands

Similar to apocrine glands

Found in the female breast

Produce milk at childbirth

Can continue to produce milk as long as a child is nursing

AgingCell division (mitosis) decreases

Demis becomes thinner

Adipose in hypodermis decreasesWhat effect might this have on the elderly?

Fewer blood vessels

Hair follicles decrease

Melanocytes decreaseGrey hairPale skin

UV radiation causes wrinkles , benign skin growths and skin cancer

The Integument and homeostasis

Protection

Regulate water loss

Excretion

Vitamin D

Sensory organ

Body temperature regulation

Content Check

Which glands begin secretion at puberty and contain a sex attractant? _________________

Which of the following pathologies causes women to develop excessive body and facial hair?

a) alopecia

b) hirsutism

c) acne vulgaris

Apocrine glands

Homework

Text pg. 96 “Study Questions” # 6 - 11

Lesson 7Review

Do Now

Read pg 88-89, section on Skin CancerWhat is skin Cancer?

Can anyone get skin cancer?

Name and describe the different types of skin cancer.

Do Now

Text pg. 96 “Learning Objectives” # 1-11

Homework

Text pg. 96 “Learning Objectives” # 6 - 11