Which substance protects the body from ultraviolet rays?

Rationale

Melanin protects the body from ultraviolet rays.

Melanin is a pigment produced by cells called melanocytes in the skin. It has the capacity to absorb harmful ultraviolet (UV) radiation and transform it into heat, which protects the skin from UV damage that can lead to sunburn and skin cancer.

A (Keratin) YOUR ANSWER

Keratin is a protein found in the skin, hair, and nails. It contributes to the structure and hardness of these tissues, but it does not have the capacity to absorb UV radiation and protect the skin from its harmful effects.

B (Sebum) YOUR ANSWER

Sebum is an oily substance produced by the skin's sebaceous glands. While it helps to moisturize and protect the skin from bacterial infections, it does not have UV protective properties.

C (Perspiration) YOUR ANSWER

Perspiration, or sweat, is produced by the sweat glands in the skin to regulate body temperature. While it can help to cool the body during exposure to heat or physical activity, it does not offer protection against UV radiation.

D (Melanin) CORRECT

Melanin is produced by melanocytes in the skin in response to UV radiation. It absorbs UV radiation and transforms it into heat, effectively preventing UV rays from causing direct damage to the DNA in skin cells. This protective role helps to prevent the development of skin cancer.

Conclusion

Among keratin, sebum, perspiration, and melanin, only melanin has the ability to protect the body from harmful UV radiation. It does this by absorbing UV radiation and turning it into heat, thereby preventing the radiation from damaging the DNA in skin cells. The other substances have various roles in the body, but they do not offer protection against UV radiation.

Which substance protects the body from ultraviolet rays?

Melanin protects the body from ultraviolet rays.

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