Final answer:
The main structures in the hair follicle are the hair shaft, hair root, and hair bulb.
Step-by-step explanation:
The main structures in the hair follicle are the hair shaft, hair root, and hair bulb.
The hair shaft is the visible part of the hair that extends above the surface of the skin.
The hair root is the part of the hair that is embedded within the hair follicle and extends into the dermis.
The hair bulb is a structure at the base of the hair root that surrounds the dermal papilla and contains the living cells responsible for hair growth.