Complexion - Complexion and Biology

Complexion and Biology

A person's complexion is a biological trait. The protein molecule known as melanin causes variation in tone. Melanocytes insert granules of melanin called melanosomes into the other skin cells of the human epidermis. The melanosomes in each recipient cell accumulate atop the cellular nucleus, where they protect the nuclear DNA from mutations caused by the sun's ionizing radiation. The human body tends to protect itself against harmful surroundings. The epidermis of the body, very sensitive and delicate, reacts almost immediately to most outside effects. People whose ancestors lived for long periods in the regions of the globe near the Equator generally have more active melanocytes, and therefore larger quantities of melanin in their skins. This makes their skins very dark and protects them against high levels of exposure to the sun (it also depends on the country). In areas of the globe closer to the poles, people have far less need for protection from ionizing radiation, so their skin is usually lighter.