Name the hormone secreted by testes.

Testes:

1. Hormones are the chemical messengers that are released directly into the bloodstream by endocrine glands. These substances reach their target organs and regulate physiological function.
2. Testes are the pair of primary reproductive organs in human males.
3. These organs are responsible for producing sperm and synthesizing and secreting the male sex hormone, testosterone.
4. This hormone is responsible for developing the reproductive system and secondary sexual characteristics in males.