Ch 5 pt 2 Flashcards
types of sweat glands
- eccrine
- apocrine
location of eccrine
concentrate on palms, soles of the feet, and forehead
structure of the eccrine
coiled, tubular glands in dermis; duct extends into pore at the skin surface
composition of secretion of eccrine
mostly water with trace salts, antibodies, metabolic wastes
function of eccrine
prevent overheating of the body
location of apocrine
axillary and anogenital regions
structure of ecrrine
ducts empty into hair follicles
composition of secretions of eccrine
same as true sweats, plus lipids and proteins: when decomposed by bacteria on the skin -> body odor
function of eccrine
not yet known, starts at puberty and are activated by pain, stress, and arousal - sexual scent glands
modifications of eccrine
ceruminous and mammary
ceruminous gland
found in the external ear canal; secret cerumen (earwax); deters insects and blocks entry of foreign substances
mammary gland
secrete milk
location fo secaceous (oil) gland
all of the body except palms and soles
function of sebaceous (oil) gland
secrete sebum, an oily substance that softens and lubricated hair and skin, slows water loss, and is bacterial
location of hair & hair follicles
distributed over the entire skin surface except palms, soles, lips, nipples and portions of the external genitalia
function of hairs & hair follicle
a. sense insects on the skin
b. guard head against physical trauma, heat loss, and sunlight
c. eyelashes shield the eyes
d. nose hairs filter large particles from air
structure of a hair
flexible strands produced by hair follicles; consist largely of dead, keratinized cells
structure of a hair follicle
a. fold down from epidermal surface into the dermis
b. arrector pili muscle- bundle of smooth muscle cells; contraction cuases hair to stand on end in response to cold or fear
types of hair
vellus and terminal
