Question

question 82 (1 point)
____ helps protect sensitive cells from uv rays.
a melanin
b keratin
c elastin
d sebum

question 83 (1 point)
the living skin at the base of the nail plate is the ____.
a hyponychium
b bed epithelium
c free edge
d eponychium

question 84 (1 point)
what type of hair is short, fine, unpigmented, and downy?
a terminal hair
b androgenic hair
c vellus hair
d feathered hair

Explanation:

Question 82

Melanin is a pigment in the skin that absorbs UV radiation, protecting underlying cells. Keratin is a structural protein, elastin provides elasticity, and sebum is an oily secretion for moisturizing, not UV protection.

The bed epithelium (also called nail bed) is the living skin at the base of the nail plate. Hyponychium is under the free edge, free edge is the distal part, and eponychium is the cuticle.

Vellus hair is short, fine, unpigmented, and downy (e.g., peach fuzz). Terminal hair is coarser/pigmented, androgenic hair is terminal hair influenced by androgens, and feathered hair is a styling term, not a hair type.

Answer:

a. Melanin

Question 83