How does the sperm cell makes entry in egg cell
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The sperm cell has a chemical in its head known as Acrosome which helps the sperm cell to be penetrate the plasma membrane of ovum and get inside the egg cell or ovum for the process of fertilisation.
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During fertilization, a sperm must first fuse with the plasma membrane and then penetrate the female egg cell in order to fertilize it. Fusing to the egg cell usually causes little problem, whereas penetrating through the egg's hard shell or extracellular matrix can present more of a problem to the sperm.
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