Podcast
Questions and Answers
What is the primary function of GnRH?
What is the primary function of GnRH?
Inhibin is produced in the hypothalamus.
Inhibin is produced in the hypothalamus.
False (B)
What specific cells in the testes are stimulated by FSH?
What specific cells in the testes are stimulated by FSH?
Sertoli cells
LH causes interstitial cells in the testes to produce more __________.
LH causes interstitial cells in the testes to produce more __________.
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What role does inhibin play in hormone regulation?
What role does inhibin play in hormone regulation?
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Which gland produces FSH?
Which gland produces FSH?
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Match the hormones with their respective roles:
Match the hormones with their respective roles:
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Testosterone is secreted directly into the brain.
Testosterone is secreted directly into the brain.
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Study Notes
Hormones
- GnRH: Produced by the hypothalamus; acts on the anterior pituitary gland, stimulating FSH and LH release.
- FSH: Produced by the anterior pituitary; targets Sertoli cells in the testes, promoting sperm production (spermatogenesis) in seminiferous tubules. Also regulates hormone levels and secretes inhibin.
- LH: Produced by the anterior pituitary; targets interstitial cells in the testes, stimulating testosterone production.
- Inhibin: Produced in the testes (Sertoli cells); regulates FSH levels to control sperm production. When high FSH is detected, anterior pituitary is signaled to decrease FSH production.
- Testosterone: Produced in the testes (interstitial cells); secreted into the bloodstream. It supports spermatogenesis by acting on Sertoli cells and maintains secondary sexual characteristics.
Feedback Loops
- Low sperm count and inhibin levels signal the hypothalamus to increase GnRH production. This leads to increased FSH and LH production, boosting testosterone output.
- High testosterone levels create negative feedback on the hypothalamus, preventing further GnRH release.
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Description
Explore the intricate roles of hormones like GnRH, FSH, and LH in the male reproductive system. This quiz delves into how these hormones interact, their production sites, and the feedback mechanisms that regulate sperm production. Test your understanding of the hormonal control of reproduction.