Editing Hyperactivation (section)

==Importance to fertilization==
Before reaching the egg, the sperm are often trapped in [[epithelium|epithelial cells]] in a [[fallopian tube]], meaning they are rendered inert unless they undergo hyperactivation. The change in motion and force of the tail movements enable the sperm to escape from the epithelium.  Thus, only those sperm which have undergone hyperactivation have the ability to fertilize the egg.<ref>{{cite journal|last=Suarez|first=SS|title=Control of hyperactivation in sperm|journal=Hum Reprod Update|date=Nov–Dec 2008|volume=14|issue=6|pages=647–57|doi=10.1093/humupd/dmn029|pmid=18653675|doi-access=free}}</ref>