Concept
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Hormonal Regulation of the Reproductive System
The negative feedback loop of the male reproductive system
GnRH, secreted by the hypothalamus, stimulates the production of FSH and LH from the pituitary gland. These hormones encourage the development of sperm cells within the testicles, which then produce inhibin and inhibit the production of GnRH, FSH and LH in a negative feedback loop.
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"Hypothalamus pituitary testicles axis."
http://en.wikipedia.org/wiki/File:Hypothalamus_pituitary_testicles_axis.png
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