What are the functions performed by the testis in human beings?

(N/A) The testes are the primary male reproductive organs located outside the abdominal cavity within a pouch called the $scrotum$.
Functions of the testes:
$1$. $Spermatogenesis$: The testes are responsible for the production of male gametes, known as $sperms$.
$2$. Hormone production: The testes secrete the male sex hormone, $testosterone$. This hormone is responsible for the development of secondary sexual characteristics in boys during puberty, such as the deepening of the voice, growth of facial hair, and increased muscle mass.