What is one of the primary functions of the testes?

The primary function of the testes is the production of sperm, which is essential for human reproduction. The testes are the male reproductive organs responsible for generating sperm cells through a process called spermatogenesis. This process occurs within the seminiferous tubules of the testes, where diploid germ cells undergo division and maturation to form mature spermatozoa.

In addition to sperm production, the testes also play a crucial role in hormone production, particularly testosterone, which is vital for the development of male secondary sexual characteristics and the maintenance of reproductive functions. This understanding clarifies the critical role the testes play in male fertility and overall reproductive health.

Other options, such as the production of eggs, secretion of estrogen, and storage of zygotes, relate more specifically to female reproductive functions and are not associated with the primary roles of the testes in male reproduction.