Which hormone is associated with the male testes?

Testosterone is the primary male sex hormone produced mainly in the testes. This hormone plays a crucial role in the development of male reproductive tissues, such as the testes and prostate, as well as promoting secondary sexual characteristics like increased muscle and bone mass, and the growth of body hair. It is essential for the regulation of libido, bone density, fat distribution, and the production of sperm.

In the male endocrine system, testosterone is synthesized in Leydig cells located in the interstitial space of the testes, which are responsive to luteinizing hormone (LH) released by the pituitary gland. This regulation ensures that testosterone levels are maintained properly to support the physiological functions related to male reproductive health.

Other hormones listed, such as estrogen and progesterone, primarily have roles associated with female reproductive processes. Oxytocin, while involved in various functions like social bonding and childbirth, does not have a direct association with the testes or male reproductive functions. Thus, testosterone stands out as the hormone linked specifically to the male testes.