Summary: Human Development
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2. The reproductive system in males
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Why are spermatozoa placed 'outside' of the body?
Spermatozoa like to develop 1 degrees celsius colder than the body temperature of 37 degrees celsius. The testes are located in the scrotum to have this colder temperature. -
What is the structure of the testis?
The testis consist of seminiferous tubules and connective tissue. -
What are sustentacular (Sertoli) cells?
Sustentacular (Sertoli) cells sustain and promote development of sperm. -
What are the two types of male germ cells (spermatogonia)?
Type A: duplicate themselves via mitosis. This is symmetric division.
Type B: develop into sperm via meiosis. This is asymmetric division. -
What causes variability in meiosis? Why is this necessary?
Recombination causes variability in meiosis. This is necessary to increase genetic variation. -
What is the acrosomal cup? What does it contain?
The acrosomal cup is the fusion of the nucleus and the Golgi apparatus. It contains enzymes to penetrate the egg (hyaluronidase & acrosin). -
Why does sperm lack organelles?
It reduces size and mass and it must absorb nutrients from the surrounding fluid. -
What is the anatomy of a spermatozoon?
A spermatozoon contains a head, neck, middle piece, and tail. -
What does the head of a spermatozoon consist of?
The head of a spermatozoon contains the nucleus and chromosomes. -
What does the neck of a spermatozoon consist of?
Contains centrioles (anterior: mitotic spindle; posterior: continuous microtubules for movement of flagellum).
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