Summary: Human Development

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  • 2. The reproductive system in males

    This is a preview. There are 25 more flashcards available for chapter 04/02/2019
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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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