A & P

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Term

Definition

The Integumetary System Includes

glands, hair, nails, skin

Skin

classified as an organ

Functions of the Skin

protects the body from injury, prevents internal body cells from drying out, maintains body temperature

Layers of the Skin

epidermis, dermis

Epidermis Includes

keratin, stratum germinativum, stratum corneum, melanin

Epidermis

the outermost layer; contains keratin; non-vascular layer

Keratin

protein that is tough, waterproof; fill skin cells

Layers of the Epidermis

stratum germinativum, stratum corneum

Stratum Germinativum

layer of the epidermis that is the only one capable of producing new cells

Stratum Corneum

outer epidermis that flakes off as the skin renews itself

Melanin

pigment that gives skin its color; dark-skinned people will have more pigment; cells that are active and produce more melanin (freckles- irregular patches of melanin

Dermis

AKA corium; true skin; innermost layer; has blood vessels, nerves, and glands

Layer of the Dermis

subcutaneous layer

Subcutaneous Layer

has a generous supply of adipose tissue

Skin

classified as an organ; enveloping membrane; AKA integumentary system; does not breathe; heat is lost from the skin by evaporation

Skin Contains Kinds of Tissue

nerve, connective, epithelial

Skin Properties

pH slightly acidic, prevents growth of pathogens; contains compound converted to VitD (sunshine) when exposed-uv rays of the sun (ca assists absorption of Vit D); people who sunbathe more prone to wrinkles, skin cancers, dry skin & sunburn

Sweat Glands

regulate heat, odor, & sweat; called suderiferous glands; main function-regulate body temp.; when functioning, we perspire from pores; ceruminous

Pores

openings of the sweat glands

Ceruminous Gland

modified sweat gland; produce cerumen (ear wax) that protects the ear drum

Sebaceous Glands

sac-like structure that secretes sebum; secrete substances into a hair follicle; main function is to lubricate skin

Sebum

very oily substance

Hair

covers most of the body (not palms of hands or soles of feet); consists of dead cells and keratin; will grow as long as the follicle is not destroyed