ANATOMY

Detailed explanation-1: -Testosterone is the male sex hormone secreted by the testes in males. It stimulates secondary sexual characteristics in men. These characteristics include growth of beard, growth of mustache, hoarse voice, etc.

Detailed explanation-2: -Secondary sexual characteristics develop during puberty. Secondary sexual characteristics in males include the growth of pubic hair, and facial hair and the voice deepens. Female secondary sexual characteristics include breasts develop, hips widen, and pubic hair begins to grow.

Detailed explanation-3: -Secondary sexual characteristics are those that emerge during the prepubescent through postpubescent phases (e.g., breasts in females and pigmented facial hair in males).

Detailed explanation-4: -Testosterone is responsible for the development of secondary sex characteristics, features of male development (including characteristics that are not part of the reproductive system, such as facial hair growth and voice change).