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Comment upon the following: At the t...

Comment upon the following:
At the time of birth, the testes descend down into the scrotal sac.

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Sperm development requires a tempera ture which is a few degrees less than the normal body temperature. Scrotum has almost no fat insulation, so it keeps the testes at a cooler temperature. Also contraction or relaxation of muscles moves the scrotum close to or far from testes and heat of the body according to the environmental temperatures.
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