What is the primary function of melanin in the integumentary system?

• A. To produce vitamin D
• B. To regulate body temperature
• C. To provide structural support to the skin
• D. To protect the skin from ultraviolet radiation

Answer: (D)

Verified step by step guidance

1. Understand the role of melanin: Melanin is a pigment produced by cells called melanocytes in the skin. It is responsible for the coloration of the skin, hair, and eyes.
2. Identify the primary function of melanin: The main function of melanin is to absorb and dissipate ultraviolet (UV) radiation from the sun, thereby protecting the skin cells from UV damage.
3. Consider the options provided: Evaluate each option in the context of melanin's role. Producing vitamin D is a function of the skin but not directly related to melanin. Regulating body temperature involves sweat glands and blood vessels, not melanin. Providing structural support is a function of collagen and elastin, not melanin.
4. Focus on UV protection: Melanin's ability to absorb UV radiation helps prevent DNA damage in skin cells, reducing the risk of skin cancer and other UV-related damage.
5. Conclude with the correct function: Based on the understanding of melanin's role, the primary function of melanin in the integumentary system is to protect the skin from ultraviolet radiation.