Integumentary system A+P CH.8 lecture 1
composed of skin, hair, and nails
functions
protects from pathogens
balances fluid levels
stores fatty tissue for energy
produces vitamin D
sensory input
regulates body temperature
skin
largest organ
epidermis, dermis and hypodermis
epidermis
layer we see on outside
Stratum Corneum
no blood vessels or nerve endings
surface cells shed
outermost layer of dead cell
Stratum Basale
where new cells grow
melanocytes
responsible for skin color
located in epidermis
produce melanin
melanin patches on skin form freckles
carotene
skin pigment that gives yellowish tint to skin
albinism
very little pigment in skin, hair and eyes
inherited gene
juandice
yellow skin
body cant break down bilirubin
bronze color
adrenal gland disease
causes skin to produce too much melanin
Ecchymosis
bruised skin
skin, blood or circulatory problems
Dermis
layer below epidermis
contains
capillaries
callogenous/elastic fibers
involuntary muscles
nerve endings
lymph vessels
hair follicles
hair follicles
sudoriferous glands (sweat)
sebaceous glands (oil)
nerve fibers
allow you to sense what is happening in environment
apocrine sweat glands
secrete at hair follicle, groin & anal, and armpits
eccrine glands
palms, feet, forehead and upper lip