The ejaculation represents the second step in the maturation of the sperm cells.
In this process, the motile capabilities of the spermatozoa are abruptly activated. The precise mechanisms of this activation are still unclear. The following factors count, though, as at least contributing:
- The mechanical stimulation during the ejaculation.
- The admixture of the glandular secretions that
a) lead to dilution of the sperm cell concentration, and
b) takes part in the chemical activation.
The result of the interaction of the mechanical stimulation by the ejaculation and the chemical effects of the glandular secretions on the sperm cells correspond with a physiological activation of the sperm cells so that they are ready to go through the upcoming capacitation and the acrosome reaction - both are preconditions for an approach and binding of the spermatozoa to the pellucid zone of the oocyte.