Question
Biology Question on Environmental Issues
Melanin protect from
A
U.V. rays
B
Visible rays
C
Infrared rays
D
X-rays
Answer
U.V. rays
Explanation
Solution
The correct option is (A) : U.V. rays
Melanocyte Stimulating Hormone (MSH), which affects the skin's melanocytes, is released by the pituitary gland's intermediate lobe. These cells create melanin, a coloured pigment that reflects UV-A light away from the skin. This stops the UV rays from damaging the DNA of the body's other sensitive cells or from penetrating those cells in the first place. This is the reason that when exposed to strong sunshine, the body tans. It serves as a defence mechanism.