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what distinguishes thick skin from thin skin?
thick- more nerve endings, more sweat glands, no hair, no sebaceous glands
thick skin on palms
what is the protein that fills the skin cells?
function of the skin pigment?
protect from UV light
how many tissue groups are found in the skin?
all of them
function of dermal papillae?
- prevent epidermal slipping
- increase friction
what produces fingerprints?
epidermal ridges (the result of dermal papillae)
what immune cells live in the skin?
life history of keratinocyte?
- made in the stratum basale
- moves upward away from the blood supply
- fills with keratin
- loses organelles
what produces water proofing of the skin?
- lipid filled vesicles
- no skin glands in epidermis
what are skin glands found?
temperature regulation by the skin?
to cool down- vessels dilate and sweat glands produce more water
to warm up- vessels constrict (to the point of no blood flow)
what are the skin glands and what do they secrete?
sweat glands- merocrine: watery secretions that contain some electrolytes and acids, ducts open into the skin
sweat glands- apocrine: thick secretions with lipids, serve as scent glands, don't develop until puberty, ducts open into the hair follicle
sebaceous glands- produce lipid rich secretions that moisturize the skin, ducts open into hair follicles
anatomy of a hair?
hollow core surrounded with dead cortex, with erector muscle and sensory nerve attached to each hair
every hair has own nerve and muscle
anatomy of a nail?
thicker keratin, cells are dead, grows from nail matrix beneath nail fold
what differentiates bone from other connective tissue?