Explanation

The acrosome of sperm contains lytic enzymes such as cathepsin, acid phosphatase, hyaluronidase, proacrosin. Hyaluronidase enzyme is found particularly in the sperms of mammals. This enzyme dissolves corona radiata enables the sperm to penetrate through it. Proacrosin changes into acrosin and helps to dissolve the zona pellucida layer of the ovum.