What Causes Sunburns?

The video discusses the importance of sunscreen in protecting against skin cancer caused by UV radiation. It explains how UV radiation is divided into UVA, UVB, and UVC, with UVA causing tanning and UVB leading to sunburn. The skin's defense mechanism involves melanocytes producing melanin to absorb UV radiation. If UVB damages DNA, cells may undergo apoptosis, leading to sunburn. Sunscreen helps by absorbing or reflecting UV radiation, reducing the risk of skin damage and cancer.

Why is it important to wear sunscreen when going outside?

• To avoid insect bites

• To prevent dehydration

• To reduce the risk of skin cancer

• To enhance vitamin D production

What is the primary role of melanin in the skin?

• To give the skin a lighter color

• To cause skin cells to multiply

• To increase the production of vitamin D

• To absorb UV radiation and protect skin cells

Which type of UV radiation is most likely to cause sunburn?

• UVA

• Infrared

• UVC

• UVB

What happens to skin cells when they are damaged by UVB rays?

• They become cancerous immediately

• They produce more melanin

• They undergo apoptosis

• They multiply rapidly

How does sunscreen help protect the skin?

• By cooling the skin

• By reflecting or absorbing UV radiation

• By increasing blood flow to the skin

• By moisturizing the skin