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What is the thickened, club-shaped structure that forms the lower part of the hair root?

  1. Hair shaft

  2. Hair follicle

  3. Hair bulb

  4. Dermal papilla

The correct answer is: Hair bulb

The hair shaft refers to the visible part of the hair that extends out of the skin. The hair follicle is a tunnel-like structure in the skin where the hair root is located. The dermal papilla is a small projection at the base of the hair follicle that provides nourishment to the hair root. Only the hair bulb, which is the thickened, club-shaped structure at the bottom of the hair root, forms the lower part of the hair root.