Union of gametes
The fertilization occurs when the sperm, with the enzymes contained in acrosome, manages to break the protective covers of the egg and introducing the core, with 23 chromosomes, which will merge with the core of the egg, also with 23 chromosomes, to form the zygote, the first diploid cell (with 46 chromosomes) of the new individual.
Once fertilized, the ovum generates the fertilization membrane, and no other sperm will be able to fertilize it again. The zygote will begin to divide into more diploid cells and travel to the uterus where it will implant.
As fertilization has occurred, the corpus luteum does not degenerate and continues to secrete progesterone and the endometrium continues to thicken, without menstruation occurring.
Fecundacion humana: La odisea de los... por raulespert