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Millions of sperms and ovum is formed.Only a sperm and ovum fused to form a zygote.Then what happens to the other sperms moving to the oviducts?

Millions of sperms are produced. Of these only a few thousands make the journey from the vaginal canal to the oviducts. This may take 4-8 hours. The life of the sperm is 1-3 days after the ejaculation and dies off.
In the fallopian tubes, many sperms surround an egg. However, only one enters the egg leaving behind the tail. The enzymes of the acrosome digest the several layers of tissue to reach the egg cytoplasm. Once the sperm is inside, the male and female nuclei become lighter and are called pro-nuclei. The two pro-nuclei fuse forming a zygote.

Once a sperm enters an egg, the thickening of the outer walls of the egg blocks the entry of other sperms.


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