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Explain the counter-current heat exchang...

Explain the counter-current heat exchange mechanism in human testis.

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Testicular arteries that descend into the scrotum are surrounded by a plexus of veins, which ascend the testis and form a pampiniform plexus. Blood that returns from the testes through these plexus is cooler than the blood in testicular arteries.
The arterial blood is cooled by venous blood by a counter-current heat exchange mechanism.
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