chapter 6 terms

Stratum Corneum

• outermost layer

Stratum Lucidum

• thick skin, lack in thin skin

Stratum Basale

• growth

• Cells are dividing

• new skin cells

Keratinization

• hardening

• Occurs in epidermal

Epidermis

• superficial thin layer

• Basement membrane

• die bc too far from their nutrient supply

• mitosis increase when healing “shallow cut”

Dermis

• Blood vessel supple from Nutrient and oxygen

Lunula (nail)

• site of nail growth

Arrector Pili Muscle (hair)

• hair follicle

• smooth muscle (located)

Hair shaft

• dead cells

• Epidermal cells

Vasoconstriction Blood Vessel

• decrease

• Tighten

• Skin pale n cool

• Keep heat inside

Sebum

• softens hair

• Lubricates hair

• Waterproof skin

Vasodilation Blood Vessel

• increase

• Widen

• Skin warmer or red

• Helps cool body

Erythema

Reddened Skin

Superficial, partial thickness burn

• first degree burn

• Only epidermis

• no scarring

• heals quickly

Deep, partial thickness burn

• second degree burn

• Destroy epidermis n some dermis

• heals more slowly

ex burn from hot liquid

Full thickness burn

• third degree burn

• Destroys epidermis, dermis, accessory structures

Apocrine sweat gland

• response to emotional; PAIN

Merocrine (eccrine) sweat gland

• located everywhere in the body

• It cools skin like mainly water, some salt

Melanin (skin color)

• AMOUNT produced

• Mutations

• Same # of melanocytes

• Pigment protein

• specialized skin cells

thick skin

• palms of the hands and the soles of the feet

Integumentary system

• the skin

• It’s accessory organs

• Hair, skin jug nail, glands, sensory receptors