NATS 1675 17 LNs

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Male Reproductive System - Hormone Regulation

Last updated 8:34 PM on 4/18/26
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11 Terms

1
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Hormones that control reproductive function are secreted by which glands?

Hypothalamus, anterior pituitary and testes.

2
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Hormones from the Hypothalamus, Anterior pituitary and Testes do what?

  1. Initiate and maintain sperm cell production

  2. Regulate the development and maintenance of sex charcteristics


3
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What is the most important male sex hormone?

Testosterone (produced mostly by Interstitial (Leydig) cells)

4
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2 controls of the Hypothalamus

  1. maturation of sperm cells via hormones

  2. dvlpmt of male secondary characteristics via hormones (mainly testosterone)


5
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3 Functions testosterone

  1. stimulates testes and sperm dvlpmt

  2. underlies sex drive

  3. causes secondary sex characteristics


6
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Secondary sex characteristics of testosterone

  • deep voice

  • increased hair growth,

  • thicken bones, vocal cords, skin

  • enlarge skeletal muscles, larynx


7
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Hypothalamus and (Gonadotropin-Releasing Hormone) GnRH

  • GnRH stimulates anterior pituitary to produce/secrete LH and FSH

  • GnRH is a regulatory hormone (affects hormones and structures)


8
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Luteinizing hormone (LH) → testosterone production

  • stimulates interstitial (leydig) cells to produce/secrte testosterone

  • called interstitial cell stimulating hormones (ICSH)


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Follicle stimulating hormone (FSH) → sperm production

  • stimulates sertoli cells to secrete andogren-binding protein (ABP)

  • ABP binds to testosterone keeps it inside seminiferous tubule

  • stimulates spermatogenesis increasing sperm count


10
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<p>Negative Feedback Loops and Testosterone Regulation</p>

Negative Feedback Loops and Testosterone Regulation

  • Hypothalamus releases GnRH

  • GnRH stimulates anterior pituitary to secrete LH

  • LH stimulates production of testosterone by interstitial cells

  • increase testosterone lvls inhibits release of GnRH


11
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<p>Negative Feedback Loops and Sperm Regulation</p>

Negative Feedback Loops and Sperm Regulation

  • Hypothalamus releases GnRH

  • GnRH stimulates anterior pituitary to secrete FSH

  • FSH stimulates sertoli cells to secrete ABP

  • ABP binds to testosterone, stimulates spermatogenesis → increase sperm count

  • increase sperm count → sertoli cells secrete inhibin → inhibits FSH and GnRH

  • FSH and GnRH lvvld drop → sperm production decreases