Assessment Technologies Institute (ATI) Test of Essential Academic Skills (TEAS 7) Science 2026 Practice Test

Melanin is produced primarily by specialized cells known as melanocytes, which are predominantly found in the skin, hair follicles, and the iris of the eyes. These melanocytes are responsible for synthesizing and distributing melanin, the pigment that gives color to skin, hair, and the iris, as well as providing some protection against the harmful effects of ultraviolet (UV) radiation.

In the skin, melanin production is stimulated by UV exposure, which is why individuals may tan when exposed to sunlight. The presence of melanin in the hair follicle determines hair color, while the amount and type of melanin in the iris contribute to eye color. Therefore, the correct answer encompasses the primary locations in the body where melanin is produced, highlighting the interconnectedness of pigmentation in these three areas.