PHYSIOLOGY
REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cells of corona radiata trap all the sperms except one
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Only two sperms nearest the ovum penetrate zona pellucida
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Secretion of acrosome helps one sperm enter cytoplasm of ovum through Zona pellucida
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All sperms except the one nearest the ovum lose their tails.
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Detailed explanation-1: -Final answer: During fertilization in humans, only one sperm penetrates zona pellucida and enters inside it. Q. What happens during fertilization in humans after many sperms reach close to the ovum? Q.
Detailed explanation-2: -When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote.
Detailed explanation-3: -As the sperm approach the egg, they bind to the zona pellucida in a process known as sperm binding. This triggers the acrosome reaction, in which the enzymes of the acrosome are freed. These enzymes then begin to digest the zona pellucida and allow the sperm to tunnel toward the egg’s plasma membrane.
Detailed explanation-4: -Acrosome or the head of the sperm releases an enzyme called hyaluronidase which facilitates the entry of the sperm into the egg.