physiology of integumentary system

Question 1

protection

Answer 1

-protects deeper tissue from mechanical damage, bacterial damage, and UV radiation
-prevent desiccation (drying out)

Question 2

sensation

Answer 2

pressure, temp, pain, touch, and movement of hairs

Question 3

temp regulation

Answer 3

-regulated by changes in volume of blood vessels in dermis

blood vessels dilate: blood flows from deeper organs to skin resulting in heat loss increase

blood vessels constrict: less blood flows to skin resulting in heat loss decrease

Question 4

vitamin D production

Answer 4

aka Calcitriol: hormone involved in regualtion of calcium homeostasis

-calcium needed for bone metabolism, nerve and muscle function, and clotting

when exposed to UV light: 7-dehydrocholesterol→cholecalciferol→
blood→liver/kidneys→calcitriol (active vitamin D3)

Question 5

excretion

Answer 5

removal of waste products
-sweat: water, salt, urea, ammonia, uric acid