Vit D synthesis, Keratinization, Melanin

Question 1

blank COVERTS TO blank when comes in contact with UV light in skin

Answer 1

7-dehydrocholesterol coverts to cholecaiferol

Question 2

Cholecaliferol role in vit D synthesis

Answer 2

cholicaiforal enters blood stream from skin, modified to calitrol in liver in kidney which is active form of Vit D

Question 3

Vit D function

Answer 3

promotes uptake of calcium and phosphate in intestines
promotes excretion of ca and phos from bones
decreases excretion of ca from kidneys
increases Ca in blood levels

Question 4

Calcium functions

Answer 4

bone formation, growth and repair
clotting
muscle and nerve function

Question 5

Dietary ways to get VIt D

Answer 5

Dairy, egg yolk, liver and supplements

Question 6

Keratinzation

Answer 6

cells move from bottom of epidermis to top, die and fill with keratin

Question 7

melanin production determined by

Answer 7

hormones
genetics
UV light

Question 8

melanin producded by

Answer 8

1.melamonocytes prodcue and package melanin into melasomes
2. melasomes prodcued in golgi apparatus of melanocyte
3. melasome in cell process
4. keartinocytes cells phagocotizes melasome

Question 9

7effects of aging on skin

Answer 9

1. epidermis thins so skin more easily damaged
2. decrease in collagen and elastin so become more wrinkly
3. skin infection increases
4. skin becomes drier
5. blood supply decreases so decrease in ability to regulate body temperature
6. functioning melanocytes increase (spots) or decrease
7. UV light ages skin more rapidly