Hormones and Feedback Loops in Reproduction

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Questions and Answers

What is the primary function of GnRH?

  • Regulates inhibin secretion
  • Supports sperm production
  • Stimulates testosterone production
  • Stimulates the release of FSH and LH (correct)

Inhibin is produced in the hypothalamus.

False (B)

What specific cells in the testes are stimulated by FSH?

Sertoli cells

LH causes interstitial cells in the testes to produce more __________.

<p>testosterone</p> Signup and view all the answers

What role does inhibin play in hormone regulation?

<p>It decreases FSH production when high levels are detected. (D)</p> Signup and view all the answers

Which gland produces FSH?

<p>Anterior pituitary gland</p> Signup and view all the answers

Match the hormones with their respective roles:

<p>GnRH = Stimulates release of FSH and LH FSH = Supports sperm production LH = Stimulates testosterone production Testosterone = Maintains secondary sexual characteristics</p> Signup and view all the answers

Testosterone is secreted directly into the brain.

<p>False (B)</p> Signup and view all the answers

Flashcards

What is GnRH?

A hormone produced by the hypothalamus that targets the anterior pituitary gland. It stimulates the release of FSH and LH.

What does FSH do?

A hormone produced by the anterior pituitary gland that acts on the Sertoli cells in the testes. It plays a key role in sperm production (spermatogenesis).

What does LH do?

A hormone produced by the anterior pituitary gland that targets the Leydig cells (interstitial cells) in the testes. It stimulates the production of testosterone.

What is Inhibin?

A hormone produced by the Sertoli cells in the testes. It acts as a negative feedback mechanism, regulating the production of FSH.

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What is Testosterone?

A hormone produced by the Leydig cells in the testes. It plays a crucial role in sperm production, male sexual development, and maintaining secondary sex characteristics.

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Where is FSH produced?

The pituitary gland has two lobes: the Anterior and Posterior Pituitary. Where is FSH produced?

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Where is LH produced?

The pituitary gland has two lobes: the Anterior and Posterior Pituitary. Where is LH produced?

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Where is GnRH produced?

The pituitary gland has two lobes: the Anterior and Posterior Pituitary. Where is GnRH produced?

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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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