Question

which structure is highlighted?
sudoriferous gland
arrector pili muscle
hair root
hair bulb

Explanation:

The arrector pili muscle is a small muscle attached to hair follicles. When it contracts, it causes the hair to stand up. Sudoriferous glands are sweat - producing glands. The hair root is the part of the hair within the follicle, and the hair bulb is the expanded base of the hair follicle. Based on typical anatomical features in a skin cross - section diagram, if a muscle - like structure near hair follicles is highlighted, it is likely the arrector pili muscle.

Answer:

B. arrector pili muscle