Anatomy Practice Exam 2026 - Free Anatomy Practice Questions and Study Guide

Melanin serves a vital protective function for the skin primarily by acting as a shield against ultraviolet (UV) light. When skin is exposed to sunlight, melanin absorbs some of the UV radiation, reducing the risk of DNA damage in skin cells which can lead to skin cancer. This pigment is produced by specialized cells called melanocytes, and its concentration can increase in response to sun exposure, which is why people develop a tan. This natural barrier helps minimize the harmful effects of UV radiation, making it crucial for skin health.