What substance produced by the skin helps in UV protection?

• A. Collagen
• B. Keratins
• C. Melanin
• D. Elastin

Answer: (C)

Melanin is a pigmented substance produced by melanocytes in the skin, and it plays a crucial role in protecting the skin from ultraviolet (UV) radiation. When skin is exposed to UV light, melanocytes increase the production of melanin as a protective response. This pigment absorbs harmful UV rays and dissipates the energy as heat, reducing the risk of DNA damage that can lead to skin cancer.

In addition to melanin's protective qualities, it also plays a role in determining skin color, which can influence how much UV radiation is absorbed. Individuals with higher melanin content generally possess darker skin, which provides greater natural protection against sun damage compared to lighter skin.

Other substances, while important for skin structure and function, do not provide UV protection. Collagen and elastin are structural proteins that help maintain skin integrity and elasticity, while keratins are proteins that form the outer layer of the skin and provide a barrier against water loss and environmental damage. However, they do not directly absorb UV radiation like melanin does.