Endocrine functions of testis 1.Androgens:testosterone 1)Maintenance of spermatogenesis 2)Stimulation of development of genitalia. 3)Development and maintenance of the male secondary sexual characteristics. 4)Maintenance of libido. 5)Effect on metabolism. Testosterone increases anabolism of protein,especially that in muscle and genitalia,and causes growth of the bones in the thickness,deposition of calcium salts as well enhancement of production of red cellsEndocrine functions of testis 1.Androgens: testosterone 1) Maintenance of spermatogenesis 2) Stimulation of development of genitalia. 3) Development and maintenance of the male secondary sexual characteristics. 4) Maintenance of libido. 5) Effect on metabolism. Testosterone increases anabolism of protein, especially that in muscle and genitalia, and causes growth of the bones in the thickness, deposition of calcium salts as well enhancement of production of red cells