eli5 – Why does skin darken/tan in the sun?

23 views

eli5 – Why does skin darken/tan in the sun?

In: Biology

The sun’s rays contain two types of ultraviolet radiation that reach your skin: UVA and UVB. UVA rays penetrate to the lower layers of the epidermis, where they trigger cells called melanocytes to produce melanin. Melanin is the brown pigment that causes tanning.


Other Questions You Might Be Interested In: