The existential decision of a sperm.
D000177:Acrosome / Q000502:physiology; D000818:Animals; D002633:Chemotaxis; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008297:Male; D013081:Sperm Motility; D013084:Sperm-Ovum Interactions; D013094:Spermatozoa / Q000502:physiology*
D007477:Ions