Explain the testes and its functions.

Explanation

Testes are the reproductive glands of the males. They are composed of seminiferous tubules, leydig cells and sertoi cells. Leydig cells form the endocrine part of the testes. They secretes the male sex hormone called testosterone.
Functions of testosterone:
(i) It influences the process of spermatogenesis.
(ii) It stimulates protein synthesis and controls muscular growth.
(iii) It is responsible for the development of secondary sexual characters (distribution of hair on body and face, deep voice pattern, etc).