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A snapshot of the 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.
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What is the structure of the testis?The testis consist of seminiferous tubules and connective tissue.
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What are sustentacular (Sertoli) cells?Sustentacular (Sertoli) cells sustain and promote development of sperm.
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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.
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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).
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Why does sperm lack organelles?It reduces size and mass and it must absorb nutrients from the surrounding fluid.
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What is the anatomy of a spermatozoon?A spermatozoon contains a head, neck, middle piece, and tail.
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What does the head of a spermatozoon consist of?The head of a spermatozoon contains the nucleus and chromosomes.
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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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The following topics are covered in this summary
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function, cells, testosterone
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cycle, female, function
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embryo, blastocyst, cells
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pheromones, development, erectile
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hormones, fsh, estrogen
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birth, teratogen, fas
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testis, ductus, glands
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heart, septum, blood
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determination, cells, sex
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spinal, vertebrae, arches
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cavity, mesoderm, pleuropericardial
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lung, development, phase
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neurons, brain, development
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neurons, plate, sensory
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brain, child, period
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nervous, nerves, sympathetic
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weeks, placenta, pregnancy
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events, stimulus, natural
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reflex, development, age
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stage, schema, piaget
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emotions, months, attachment