hyperactivation

hyperactivation
hy·per·ac·ti·va·tion (hi″pər-ak″tĭ-vaґshən) a stage of sperm motility after capacitation, in which the sperm moves extremely fast. If the sperm head is attached to the zona pellucida, only the tail will be moving; if it is not attached, the entire sperm will move rapidly and randomly.

Medical dictionary. 2011.

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