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when ion occurs during intercourse approximately 200 million sperm or spermatozoa are deposited into the vagina they swim through the cervix propelled by with whip-like motions of their tails or Flagela after which muscular contractions of the uterus direct them to the uterine tubes this process usually takes between 30 minutes and two hours only around 200 spermatozoa will docHub the secondary oocyte in the uterine tube and of these only one will fertilize it fertilization cannot occur until two processes have taken place capacitation and the acrosomal reaction these can take several hours capacitation is not fully understood but secretions from the uterus wall and uterine tube destabilize the plasma membrane surrounding the head the spermatozoa or acrosome resulting in the membrane becoming more fluid which helps to prepare the spermatozoa for the events a fertilization the spermatozoa become hyperactive their flagella beat more frequently and their heads move laterally the capacitate
