What happens during fertilisation in humans after many sperms reach close to the ovum?
Only two sperms nearest the ovum penetrate zona pellucida
Secretions of acrosome help one sperm enter the cytoplasm of the ovum through zona pellucida
All sperms except the one nearest to the ovum lose their tails
Cells of corona radiata trap all the sperms except one
During fertilisation, 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, ensuring only one sperm can fertilise the ovum. The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane .
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