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Enzyme sperm penetrate egg

Fertilization occurs when a sperm and an oocyte egg combine and their nuclei fuse. Because each of these reproductive cells is a haploid cell containing half of the genetic material needed to form a human being, their combination forms a diploid cell. This new single cell, called a zygote , contains all of the genetic material needed to form a human—half from the mother and half from the father. Fertilization is a numbers game.
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When Sperm Meets Egg

Enzyme sperm penetrate egg
Enzyme sperm penetrate egg
Enzyme sperm penetrate egg
Enzyme sperm penetrate egg
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Penetration, adhesion, and fusion in mammalian sperm-egg interaction.

The sperm that reach the egg swim into it and attempt to penetrate the zona pelluca, which is the semi permeable outer membrane of the egg. Some sperm have a shape which makes this relatively easy, and others which are poorly formed are likely to have more difficulty. Only one sperm cell can penetrate the egg. As soon as one sperm cell enters the egg, its membrane changes and no more sperm cells can get through. When the sperm penetrate the egg cell fertilization occurs. The sperm has a layer of acids on its head that chemically break down the wall of the egg.
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Acrosome reaction

The cytoplasm of the sperm contains NOS, which is activated along with the acrosome reaction by contact with egg jelly yellow ; above, the NOS turns green when activated and produces NO light green spray. Upon fusion with the egg, NOS is released into the egg, whereby the NO produced activates calcium release red spray. Calcium activates NOS already present in the egg, releasing more NO, which releases more calcium, and so on. In recent years, researchers have learned that nitric oxide NO is much more than an air pollutant.
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Fertilization is more a chain of events than a single, isolated phenomenon. Indeed, interruption of any step in the chain will almost certainly cause fertilization failure. The chain begins with a group of changes affecting the sperm, which prepares them for the task ahead. Successful fertilization requires not only that a sperm and egg fuse, but that not more than one sperm fuses with the egg.
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