2b. Animal Integument: External Epithelia

Question 1

what is the largest organ?

Answer 1

skinA human animal’s skin comprises about 15% of its body weight.

Question 2

A human animal’s skin comprises about what percentage of its body weight?

Answer 2

15%

Question 3

protection

Answer 3

first line of defense against pathogens and other foreign bodies

Question 4

thermoregulation

Answer 4

evaporative cooling, regulation of blood supply to the dermis (below the integument)

Question 5

vitamin d production

Answer 5

exposure of Vitamin D provitamin (7-dehydrocholesterol) to UV initiates conversion of the precursor into Vitamin D

Question 6

absorption and secretion

Answer 6

skin absorbs water-soluble molecules and excretes water

Question 7

respiration

Answer 7

In amphibians and some other species, the skin is a vital respiratory organ

Question 8

epidermis is the

Answer 8

external, thinner layer of skin.

Question 9

dermis is the

Answer 9

lower, thicker layer of skin.