The reproductive system in males

9 important questions on The reproductive system in males

What does the middle piece of a spermatozoon contain?

Contains mitochondria (= energy!) of original spermatid.

What is the importance of the tail of a spermatozoon?


It is a whip-like organelle that moves a spermcell from 1 place to another. It has a complex, corkscrew motion.

What is the function of the blood-testis barrier?

The blood-testis barrier isolates seminiferous tubules from immune system.
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What is the function of FSH in males?

  • Targets sustentacular cells to promote spermatogenesis
  • Causes secretion of androgen binding protein (and inhibin)

What is the function of inhibin in males?

It inhibits FSH production, suppresses GnRH secretion, and speeds up sperm development.

What is the function of androgen-binding protein (ABP)?

ABP prompts the spermatogenic cells to bind to and concentrate testosterone.  The concentrated testosterone then stimulates spermatogenesis.

What do stimulated interstitial cells produce?

Testosterone

What is typical about spermatozoa leaving the testes?

Testes produces physically mature spermatozoa that can NOT fertilize an egg.

How are sperm moved after leaving the testes?

Sperm cells are incapable of ‘locomotion’ or fertilization. They are moved by cilia lining efferent ductules (epi-didymis).

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