Final answer:
Sun damage is the main extrinsic cause of aging and significantly increases the risk for skin cancer. It leads to premature wrinkling and DNA damage in skin cells. Protective measures such as sunscreen and clothing are crucial to mitigate these effects.B. It is the main extrinsic cause of aging.
Step-by-step explanation:
Sun damage is the main extrinsic cause of aging. UV radiation from the sun can damage collagen fibers, leading to premature wrinkling and other signs of aging such as brown discolorations. Overexposure to UV radiation increases the risk for skin cancer, which is the most common form of human cancer. Studies show that individuals who experience sunburns, particularly in their younger years, have a higher chance of developing melanoma, which is the most deadly type of skin cancer.
UV-A light specifically creates free radicals that can cause indirect DNA damage to skin cells. Such damage can lead to out-of-control growth of cells and the formation of tumors. Moreover, excessive sun exposure can lead to the destruction of cellular structures within the skin, prompting both wrinkling and the potential for skin cancer.
To mitigate these risks, it's advised to wear sunscreen with a high SPF, a hat, and protective clothing when exposed to the sun to decrease UV radiation's impact.