Where do sperm cells form? Why are they updated periodically?

Male germ cells (sperm cells) form in the testes at a temperature of about 35 ° C, because they are located in the scrotum (skin-muscle formation), and not in the body cavity, where the temperature is slightly higher. All sperm have a large nucleus surrounded by cytoplasm, neck and tail, with which they can independently move. The composition of the sperm is periodically updated as long as the gonads function.

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