New Mexico Cosmetology Practice Exam

What role does testosterone play in hair growth?

1. It decreases hair thickness

2. It stimulates the growth of facial and body hair

3. It prevents hair loss

4. It removes unwanted hair

The correct answer is: It stimulates the growth of facial and body hair

Testosterone plays a significant role in hair growth, particularly in the development of facial and body hair. This androgen hormone promotes the transformation of fine vellus hair into thicker and more visible terminal hair during puberty, leading to increased hair growth in males, particularly on the face and body. The action of testosterone is facilitated by its conversion into dihydrotestosterone (DHT), which is a more potent androgen that has a strong influence on hair follicle characteristics. Higher levels of testosterone and DHT are associated with the development of secondary sexual characteristics, including the growth of facial hair and increased body hair density. In terms of hair loss prevention or removal, testosterone does not play a direct role in preventing hair loss in areas where it can contribute to male pattern baldness. Nor does it have an effect on the removal of unwanted hair; these aspects involve other hormonal and genetic factors. Thus, the role of testosterone in stimulating the growth of facial and body hair is accurately reflected in the provided answer.