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Testicles or testes are the pair of male glands that produce sperm fluid; the tiny sperm in the fluid each contain half the 'information' required to produce another being of the same species. The other half is provided by the egg that is produced in the female equivalent glands called ovaries. When sperm is spurted into the female via the penis and has travelled through the cervix into the womb, the thousands of sperm surround the 'waiting' egg and when one sperm is successful in piercing the egg, the egg, which is hundreds of times larger than the sperm, then prevents further sperm from doing so. The egg is then "fertilized" and eventually grows into a new being of the same species.
The testicles also produce a hormone called testosterone; this hormone in large doses is what makes a being grow into a male. Thus testicles are what makes a male a male!
Unfortunately for mammals, the testicles have to be on the outside of the body so that they do not get too warm. They are composed of tiny tubes or sperm ducts where the sperm are produced; these tubes are coiled up like very thin coils of spaghetti and are contained within an outer cover attached to the body by a thicker tube (the testicle or sperm chord). This chord has a thin walled swelling at the testicle end called the “Epididymis” and this is protected by being at the back of the testicle. This swelling is very important because it is where the sperm is stored and reaches full maturity after being produced in th...
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