In addition to regulating the formation of sperms, testosterone, a hormone secreted by the testes, brings about changes in the appearance of boys during puberty. It plays a crucial role in the development of secondary sexual characteristics, such as facial ...

The testes are located outside the abdominal cavity in the scrotum because sperm formation requires a lower temperature than the normal body temperature. This arrangement helps maintain the optimal temperature for spermatogenesis.

The male reproductive system consists of portions responsible for producing germ-cells (sperms) and other portions that deliver these germ-cells to the site of fertilization.

Mammals, including humans, require specialized organs for the sexual act because the transfer of germ-cells between two individuals is essential for sexual reproduction. In mammals, the development of organs like the erect penis is crucial for successful mating, while the ...

Changes during puberty, such as new hair-growth patterns, serve as signals indicating that sexual maturation is occurring in animals. These signals help individuals identify the readiness of others for the process of mating.