Question

why we get sun tan

a)UV radiation A
b)UV radiation B
c)UV radiation C​

Answer 1

Answer:

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Answer 2

UV radiation A

• UVA radiation is what makes people tan. UVA rays penetrate to the lower layers of the epidermis, where they trigger cells called melanocytes (pronounced: mel-an-oh-sites) to produce melanin. Melanin is the brown pigment that causes tanning. Melanin is the body's way of protecting skin from burning.

UV radiation B

• Tanning beds also emit UV radiation. Two types of UV light are proven to contribute to the risk for skin cancer: Ultraviolet A (UVA) has a longer wavelength, and is associated with skin aging. Ultraviolet B (UVB) has a shorter wavelength and is associated with skin burning.

UV radiation C

• While we need some exposure to sunlight to help our bodies make vitamin D, too much UV is dangerous. ... The atmosphere does little to shield these rays—most UVA radiation reaches Earth's surface. UVA rays cause skin aging and eye damage, and can lower your body's ability to fight off illness.