over skin notes

Question 1

functions of integumentary system

Answer 1

protection,regulation of temp., communication of sensations to CNS and synthesis of material (sweat)

Question 2

Epidermis

Answer 2

outer layer of cells contain keratin; thick layer protect from abrasion, VITAMIN D produced here

Question 3

whats keratin

Answer 3

fibrous protein that makes skin waterproof

Question 4

name the 5 layers of the epithelium

Answer 4

stratum corenum,lucidum,granulosm,spinosum,basale

Question 5

mnemonic to remember layers of epithelium

Answer 5

crazy
lucy
grows
spicy
basil

Question 6

stratum corenum

Answer 6

outer most layer, dead and dying cells; sloughs off easily; contains carotene, a yellowish pigment; fingernails are modified portion of this layer

Question 7

stratum lucidum

Answer 7

found only in thick, non-hairy skin, palms of hands and soles of feet

Question 8

stratum granulosum

Answer 8

middle layer; keratin

Question 9

stratum spinosum

Answer 9

another mid. layer of cells with spiny like projections

Question 10

stratum stratum basale

Answer 10

aka stratum germinativum-layer directly on top of dermis,MELANOCYTES FOUND BETWEEN THESE CELLS, AND PRODUCE MELANIN WHICH GIVES THE SKIN COLOR AND PROTECTS IT FROM UV LIGHT

Question 11

What structure has a high amount of keratin to make the hard

Answer 11

nails

Question 12

Nail bed

Answer 12

layer of stratum basale and stratum spinosum beneath the nail

Question 13

nail root

Answer 13

where nail grows

Question 14

nail body

Answer 14

part of nail thats visible

Question 15

eponychium

Answer 15

cuticle

Question 16

hyponichium

Answer 16

area of stratum corneum benath nail tip

Question 17

lunula

Answer 17

“half moon” of the nail

Question 18

Dermis

Answer 18

connective tissue layer w/ blood vessles,nerves,hair,glands,and fat

Question 19

Dermis- papillary layer

Answer 19

outer portion immediately below epidermis arranged in folds(finger prints)

Question 20

Reticular layer

Answer 20

deep to the papillary layer, contains collagen for toughness

Question 21

hair

Answer 21

develops from follicles in the dermis; hair has a root and shaft, structure surrounding root is termed follicle
arrector pili muscle attached to each hair

Question 22

sudoriferous, and such alike subdivisions

Answer 22

sudoriferous glands-aka sweat glands(not connected to hair shaft), for temp. control

• eccrine gland: produce a watery material;virtually all over body
• apocrine: produce thick fluid found in armpit, groin, coiled gland that opend up into hair follicle(like sebaceous glands); function after puberty

Question 23

sebaceous glands

Answer 23

oil glands that secrete their contents into hair folicle region;material released called sebum

Question 24

creuminous glands

Answer 24

wax producing

Question 25

name the Nerve endings found in integ. system

Answer 25

Meissner’s corpuscle
free nerve endings-pain
hot-cold receptors
pacinian corpuscle- deep touch

Question 26

temp. reg., when outside temp.. goes up

Answer 26

maintain body temp
sweat carries heated droplets to surface to keep internal temp. from going higher.
blood vessel in skin dilate to carry more blood to surface to allow heat to radiate out body

Question 27

temp. reg. when outside temp. goes down

Answer 27

blood vessels constrict so blood isnt carried to skin

arrector pili muscles contract, causing goose bumps, to hold heat in