Spermatic artery and vein why is venous blood warmed and arterial blood cooled?

The production of sperm requires cells to under-go the process of meiosis - that is producing cells with half the number of chromosomes of regular cells. One of the requirements for this to happen is a lower temperature than what the body typically maintains. (This is why the testicals are kept outside the body in the scrotum at a distance that varies according to the ambiant temperature.) One strategy for keeping the testicals cool is to cool the blood that comes to them via the spermatic artery.

(One cause of male sterility is too much blood flow increasing the temperature of the testicals. ) To cool the blood the spermatic artery is kept in close association with the spermatic vein which pick-up some of its heat.

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