Human sperm to human egg
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13 Nov Most of semen is not sperm, and egg count starts decreasing soon after A quantitative and cytological study of germ cells in human ovaries.
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The sperm must undergo capacitation in the female's the enzymatic penetration of the egg's tough membrane, the zona.
The human egg cell and sperm
Description:One is polar to millions. The spindle captures the chromosomes before they disperse in the egg cytoplasm. The zona pellucida has proteins that are similar to the proteins used by the immune system, and these proteins make cross-species fertilization nearly impossible. The sperm can live up to hours.