Process of fertilization Sperm bind to sperm receptor ZP-3 induce Acrosome reaction: release of acrosomal enzyme Penetration and Cell release of acrosomal membrane nucleus acrosome enzyme of ovum swnucleus acrosome Penetration and release of acrosomal enzyme Cell membrane of ovum Process of fertilization Sperm bind to sperm receptor ZP-3 induce Acrosome reaction：release of acrosomal enzyme