CH4 : Skin & Body Membranes

What does the integumentary system do?

Covers & protects body; synthesizes Vitamin D, helps regulate heat, contains sensory receptors

What are sebaceous glands and their function?

Oil glands that make sebum

What are sudoriferous glands and their function?

Sweat glands that make sweat

What is keratin and what does it do?

A protein that makes the epidermis rough and waterproof

What is melanin?

The pigment that gives skin and hair color.

Describe a 1st Degree Burn

Damages epidermis causing reddening and pain

Describe a 2nd Degree Burn

Damaged epidermis and upper dermis causing reddening, pain, and blisters

Describe a 3rd Degree Burn

Damages all layers (epidermis, dermis, & hypodermis) blackening, no pain (nerve receptors damaged); Full thickness burn.

Epidermis

Upper layer made of stratified squamous

Dermis

Lower layer made of areolar connective tissue

Hypodermis

Under layer made of adipose tissue

Sweat glands

Make sweat; found everywhere

Sebaceous glands

Make sebum; not found in palms of hands

Hair follicle

Where hair is made; hair root inside & hair shaft outside

Arrector pili

Smooth muscle that pulls on hair follicle to make hair stand up

5 stratum of epidermis from outermost layer

(Remember Bull Seeks Good Looking Cow)

Corneum, Lucidun, Granulosum, Spinosum, Basale

What is the hypodermis layer?

Subcutaneous and made up of adipose tissue.