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acrosomal reaction |
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acrosomal reaction [ak′rəsō′məl] the pattern of various chemical changes that occur in the anterior of the head of the spermatozoon in response to contact with the ovum and that lead to the sperm's penetration and fertilization of the ovum. acrosomal reaction Reproductive medicine A necessary and irreversible step in fertilization which is triggered by sperm receptor, in which the sperm's and ovum's plasma membranes fuse and the sperm penetrates the zona pellucida.
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