Ch 5, 2 Derivations of the epidermis

Question 1

sweat glands

Answer 1

2 main types of sweat (sudoriferous) glands

both secrete by exocytosis (merocrine)

Question 2

Eccrine sweat glands

Answer 2

abundant on palms, soles and forehead
sweat-99% NaCl, antimicrobial substance
-exocrine glands–connect to ducts which empty through pores
function; thermoregulation

Question 3

apocrine sweat glands

Answer 3

• confined to axillary and anogenital regions
• play no role in temperature control
• ducts connect to hair follicles
• functional from puberty on–sew attractant?
• sweat initially odorless, becomes stinky with bacteria action

Question 4

ceruminous glands

modified sweat glands

Answer 4

in external ear, produce ear wax

water proofing, bug repellant

Question 5

mammary glands

modified sweat glands

Answer 5

produce milk

Question 6

Sebaceous (oil) glands

Answer 6

• widely distributed, entire body surface but palms, soles, lips, nipples and some external genitalia
• located around hair follicles
• become active at puberty
• produce sebum
  functions: lubrication, water proofing of skin and hair, bactericidal

Question 7

Hairs

Answer 7

functions: alert body of presence of insects on skin
- guard against physical trauma, heat loss, sunlight
- insulation, pulled upright by arrector pili muscle-traps a layer of air