What is the tubelike structure from which a hair grows and emerges at the skin surface?

• A. Sweat duct
• B. Epidermal ridge
• C. Sebaceous gland
• D. Hair follicle

Answer: (D)

Verified step by step guidance

1. Understand the anatomy of the skin: The skin consists of multiple layers, including the epidermis, dermis, and hypodermis. Hair grows from specialized structures located within the dermis.
2. Identify the structure responsible for hair growth: The hair follicle is a tubelike structure embedded in the dermis. It surrounds the root of the hair and provides the environment for hair growth.
3. Differentiate the hair follicle from other structures: The sweat duct is involved in sweat secretion, the epidermal ridge contributes to fingerprints, and the sebaceous gland produces sebum (oil). None of these are directly responsible for hair growth.
4. Recognize the role of the hair follicle: The hair follicle contains the hair bulb at its base, where cells divide and keratinize to form the hair shaft. This shaft then emerges at the skin surface.
5. Conclude that the correct answer is the hair follicle, as it is the tubelike structure from which a hair grows and emerges at the skin surface.