American Academy of Professional Coders (AAPC) Practice Exam

The greatest concentration of hair follicles in the human body is found on the head. This area contains a particularly high density of hair follicles, which contribute to the growth of the hair on the scalp and face. The scalp alone is designed to house thousands of hair follicles, allowing for a thick and often voluminous appearance. The hair on the head serves both aesthetic and protective functions, shielding the scalp from environmental elements and helping regulate temperature.

While arms, back, and legs do have hair follicles, the density and concentration of these follicles are significantly less compared to those on the head. This difference is associated with hair growth patterns and the evolutionary adaptations of human skin. Thus, the head stands out as the region with the most abundant hair follicles in the human body.