how does the skin contribute to vitamin D synthesis?

Answer 1

UV rays in sunlight activate the precursor molecule in the skin which is responsible for vitamin D synthesis. Enzymes from the liver and kidneys then modify the activated molecule, finally producing calcitriol ( the most active form of vitamin D). Besides, the melanocytes (melanin- producing cells) in the skin are also activated by UV rays in sunlight. In the presence of tyrosinase, melanin is produced in large amount in order to protect your skin. So that's why when you exposed to the sun for a long time, the colour of your skin will turn dark.

Answer 2

1

Answer 3

it converts it from the sun