What is the significance of melanin production in skin cells?

What is the significance of melanin production in skin cells?

• A. It helps regulate body temperature.
• B. It protects the body from UV radiation damage.
• C. It is responsible for oxygen transport.
• D. It stores energy for cells.

Answer: (B)

Melanin production in skin cells mainly serves to shield DNA from ultraviolet (UV) damage. Melanin pigment, made by melanocytes, is loaded into melanosomes and transferred to nearby keratinocytes. When UV rays from the sun penetrate the skin, melanin absorbs much of that energy and dissipates it as heat, helping to prevent DNA mutations such as thymine dimers that can lead to skin cancer and sunburn. The amount and distribution of melanin determine skin color and the level of protection, and UV exposure can increase melanin production through signaling that boosts melanocyte activity. Other options don’t fit because they describe functions that melanin isn’t responsible for: body temperature regulation is controlled by blood flow and sweating, oxygen transport is done by hemoglobin in red blood cells, and energy storage is handled by molecules like glycogen and fats, not by pigment.

Melanin production in skin cells mainly serves to shield DNA from ultraviolet (UV) damage. Melanin pigment, made by melanocytes, is loaded into melanosomes and transferred to nearby keratinocytes. When UV rays from the sun penetrate the skin, melanin absorbs much of that energy and dissipates it as heat, helping to prevent DNA mutations such as thymine dimers that can lead to skin cancer and sunburn. The amount and distribution of melanin determine skin color and the level of protection, and UV exposure can increase melanin production through signaling that boosts melanocyte activity.

Other options don’t fit because they describe functions that melanin isn’t responsible for: body temperature regulation is controlled by blood flow and sweating, oxygen transport is done by hemoglobin in red blood cells, and energy storage is handled by molecules like glycogen and fats, not by pigment.