TESTOSTERONE :::
This is an androgen hormone derived from two sources :(1) Testes and (2) Adrenal cortex Androgen from cortex is found only in traces So mainly it is the testosterone of the testes
Functions ::
1.Growth of sex organs in the male Beside testes the development of prostate seminal vesicles and the external genitalia is also stimulated
2. Life and fertility of spermatozoa is maintained
3.Development of secondary sex characteristics such as appearance of mustache beard and hair in axillary pubic and chest regions and hoarseness of voice manly spirit also develops in the male
4.Bony structure becomes more heavy and stronger because of the stimulation by anabolic fraction of the testosterone Muscular development is more in male than in female because of the anabolic fraction of the testosterone which stimulates the protein matabolism
5.Metabolism in general is stimulated by anabolic fraction of the testosterone
6.Blood volume and RBCs are more in male than in female because of the anabolic fraction of testosterone
7.Water percentage is more in male since anabolic fraction stimulates Na+ retention and so water imbibing increase
8.Libido is inspired because of testosterone
Control of Testicular function ::
High temperature inhibits testicular activity Gonadotrophic hormones of anterior pituitary and hormones of thyroid adrenal cortex and thymus regulate testicular functions
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