Question

The active spermatozoa after contacting the oocyte undergoes acrosomal reaction and release

• A. Hyaluronidase for penetrating corona radiata
• B. Acrosin for preventing another sperms entry
• C. Corona penetrating enzyme to penetrate corona radiata
• D. Neuraminidase to penetrate egg cytoplasm

Answer 1

The correct option is A Hyaluronidase for penetrating corona radiata

After coming in contact with the oocyte, the sperm releases an enzyme hyaluronidase to disperse the layer of follicle cells (corona radiata) surrounding the secondary oocyte. When a sperm encounters an egg, openings develop in the sperm acrosome, exposing enzymes that digest a path through the zona pellucida, surrounding the secondary oocyte. As soon as one sperm enters the secondary oocyte, changes occur, that prevent the entrance of other sperm.