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# Hormones ## GnRH - Produced by the hypothalamus and the site of action is in the Anterior pituitary gland - GnRH stimulates the anterior pituitary to release FSH and LH ## FSH - Produced by the anterior pituitary gland and the site of action is in the Sertoli cells in the testes - Supports s...

# Hormones ## GnRH - Produced by the hypothalamus and the site of action is in the Anterior pituitary gland - GnRH stimulates the anterior pituitary to release FSH and LH ## FSH - Produced by the anterior pituitary gland and the site of action is in the Sertoli cells in the testes - Supports sperm production (spermatogenesis) in the seminiferous tubules - Secretes inhibin to regulate hormone levels ## LH - Produced by the anterior pituitary gland and the action is in the interstitial cells - The anterior pituitary gland sends LH to the testes where it causes interstitial cells to produce more testosterone and released into the blood until the hypothalamus detects high testosterone. ## Inhibin - Produced in the testes to regulate FSH and sperm production - The anterior pituitary is signaled to decrease production of FSH when high FSH is detected. ## Testosterone - Produced in the testes and secreted into the bloodstream - Supports spermatogenesis by acting on the Sertoli cells - Develop and maintains secondary sexual characteristics ## Diagram The diagram shows a simplified representation of the hormonal pathways involved in male reproductive function. It highlights the interactions between the hypothalamus, anterior pituitary gland, testes, and the feedback loops that regulate hormone production. * **Hypothalamus:** The hypothalamus, located in the brain, triggers the release of GnRH. * **Anterior Pituitary:** The anterior pituitary gland, stimulated by GnRH, secretes FSH and LH. * **Testes:** FSH and LH act on the testes, stimulating the production of testosterone and sperm. * **Feedback Loops:** High testosterone and inhibin act as negative feedback signals, inhibiting the further release of GnRH and LH, maintaining hormonal balance. * **Interstitial cells and Sertoli Cells:** The interstitial cells produce testosterone, and Sertoli cells, stimulated by FSH, support sperm production. The arrows in the diagram indicate the direction of hormonal signals and the production processes. The different levels of hormones, and associated effects, are illustrated in the diagram.