Chapter 2: extra stuff Flashcards
Where does hair start growing
Follicle - in the dermis
What part of the hair can you see and what can’t you see
Root - inside skin
Shaft - out of skin
what does length of hair depend on
depends on growth rate and life span
arrector pilli
attached to hair follicle - stands up when you have goosebumps
glands (sebaceous)
oil glands
- protects hair follicles
– Prevents bacteria growth
– Prevents dry skin
glands (sweat)
– Mostly water
– Sodium chloride – salt
– A little bit of ammonia/urea
Most common sweat gland and what it does
Merocrine - eccrine
- all over the place – most sweat glands – go directly to the surface
– Used to cool you off
Body odor sweat gland
Aprocine
- Active at puberty
– Sweat glands in armpits and genital area
nails
– come out of corneum stratum
– Nail root is under skin
– nail bed is under nail
aging
– Loss of hypodermis – makes skin sag
– Loss of fat – old people get colder – lack of hypodermis layer
– Elastic fibers wear out – wrinkles
– Dermis becomes thinner as you age
burns (1st degree)
A burn to the epidermis
– Usually sunburn
– Sometimes when you touch a hot stove quickly
burns (2nd degree)
A burn to the dermis
– Often gives blisters – don’t pop – infection can get in
– Swollen
– More painful
– Could be bad sunburn
burns (3rd degree)
A burn to the hypodermis
– Might have to have skin changes – no nerves
– Skin is missing
– Black or white
psoriasis
– Malfunction – could be immune system
– Skin could get flaky – elbows, knees, back, feet, hands – itchy
Dandruff
– Too much of corneum starts flaking off scalp could be too oily or too dry
– Caused by yeast like fungus
