ELi5: Why testicles are hanging outside while other organs are inside the main body of human male (other mammals too) ?
In: Biology
Testicles produce sperm, which are important to our survival. Sperm is sensitive to temperature changes, and keeping them outside of the body allows the body to control their temperature better. When it’s hot the testicles move away from the body (scrotum stretches out) and when it’s cold the testicles move closer to the body. Too hot or too cold is bad, and as sperm require a temperature lower than our body temperature, it’s best to keep them as far away from our body as possible.
The tesicles perform best on a temperature slightly below the average body temperature. This is done by placing them sort of out of the body.
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