Endocrine function of testes Androgens: testosterone, dihydrotesterone(双氢睾酮) and androstendione(雄烯二酮) Function of testosterone Maintenance of spermatogenesis Stimulation of development of genitalia Development and maintenance of the male secondary sexual characteristics Maintenance of libido Effect on metabolism increases anabolism of protein causes growth of the bones deposition of calcium salts enhancement of production of red cellsI. Endocrine Function of Testes • Androgens: testosterone, dihydrotesterone (双氢睾酮） and androstenodione （雄烯二酮） • Function of testosterone – Maintenance of spermatogenesis – Stimulation of development of genitalia. – Development and maintenance of the male secondary sexual characteristics. – Maintenance of libido. – Effect on metabolism. • increases anabolism of protein, • causes growth of the bones • deposition of calcium salts • enhancement of production of red cells