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 (goose - bumps). The sudoriferous gland is a sweat - producing gland. The hair root is the part of the hair embedded in the skin, and the hair bulb is the expanded base of the hair root. Without seeing the highlighted part, we rely on general knowledge of skin and hair anatomy. If the structure is a small, thin - looking muscle near the hair follicle, it is likely the arrector pili muscle.

Answer:

If the highlighted structure is a small muscle near hair follicle: B. arrector pili muscle; If it is a glandular structure: A. sudoriferous gland; If it is the part of hair inside the skin: C. hair root; If it is the bottom - most part of the hair root: D. hair bulb