What happens when an arrector pili muscle contracts?
A)The hair falls out of the hair bulb.
B)The hair grows approximately 0.33mm.
C)The sebaceous gland secretes oil onto the surface of the hair.
D)The sweat gland secretes sweat out of the pores next to the hair.
E)The hair follicle becomes erect,producing "goose bumps."

Question

Quizplus · Accepted Answer

When the arrector pili muscle contracts, it pulls on the hair follicle, causing it to become erect. This produces the appearance of "goose bumps" on the surface of the skin. None of the other options are correct - the contraction of the arrector pili muscle does not cause the hair to fall out or grow, and it does not affect the secretion of oil or sweat from the sebaceous or sweat glands.

What Happens When an Arrector Pili Muscle Contracts