U2- Integumentary System

Question 1

functions

Answer 1

resistance to trama and infection
sensation
thermoreg.
nonverbal comm.

Question 2

layers

Answer 2

epidermis
dermis
hypodermis

Question 3

epidermis-cell types

Answer 3

keratinocytes

melanocytes

Question 4

keratinocytes

Answer 4

synth. keratin

Question 5

melanocytes

Answer 5

synth. pigment (melanin)

branch btw keratinocy. and shed fragments

Question 6

epithelium layers (BSGLC)

Answer 6

(deep to superficial)
basal
spinosum
granulosum
lucidium
corneum

Question 7

basal layer

Answer 7

site for stem cell division (mature into keratinocytes)

Question 8

spinosum layer

Answer 8

cells getter flatter towards surface

desmosomes bridge cells together

Question 9

gransulosum layer

Answer 9

dark staining layer

Question 10

lucidum layer

Answer 10

!!seen only in thick skin!!!!

no cell boundaries visible

Question 11

corneum layer

Answer 11

surface layer

where dead, scaly keratinocytes flake off

Question 12

keratinocyte cell cycle

Answer 12

regen faster if injured
cell originate in basal and push up
cell regen is slower w/ age

Question 13

dermis

Answer 13

CT layer

houses nerves, glands, hair follicles and roots

Question 14

zones of dermis

Answer 14

papillary and reticular

Question 15

papillary zone

Answer 15

thin areolar CT towards surface

Question 16

reticular zone

Answer 16

fibrous deep

Question 17

hypodermis

Answer 17

“subcutaneous tissue”
binds skin to underlying tissue
filled w/ adipose tissue

Question 18

hemoglobin

Answer 18

red pigment of blood

areas w/ capillaries closer to surface= mre red

Question 19

dark skin

Answer 19

greater amount of melanin
granules in k-ocytes spread out
melan. breaks down slower

Question 20

light skin

Answer 20

lesser amount of melanin
granules in k-ocytes concentrated near nucleus
melan. breaks down fast

Question 21

tactile cells

Answer 21

oval shaped

sensors for light touch sensation

Question 22

Messiner’s corpuscle

Answer 22

close to skin surface

transmit sensations of fine, discriminative touch and vibration

Question 23

Pacinian corpuscle

Answer 23

look like sperm, deep in dermis

detect pressure and high-frequency vibration