What happens during fertilization in humans a | vedclass

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Question

(A) The process of fusion of a sperm with an ovum is called fertilization.During fertilization,a sperm comes in contact with the zona pellucida layer

Vedclass · Accepted Answer

Secretions of acrosome help one sperm enter the cytoplasm of the ovum through the zona pellucida.

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(A) The process of fusion of a sperm with an ovum is called fertilization.During fertilization,a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms.Thus,it ensures that only one sperm can fertilize an ovum.The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.In contact with the surface of the egg covering,the acrosome releases its contained hydrolytic enzymes,also called sperm lysins.This is known as the acrosomal reaction.The acrosomal reaction results in the dissolving of corona cells and the degeneration of the zona pellucida,which helps in sperm penetration.

What happens during fertilization in humans after many sperms reach close to the ovum?

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