Fertilisation of a human egg

Fertilisation of a human egg

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Caption: Sperm cell fertilising a human ovum, illustration. Each sperm has a rounded head and a tail which it uses to both swim and burrow into the egg (red). Women usually release one egg (ovum) per month, whereas men release millions of sperm in each ejaculation. Only one of these sperm will penetrate the egg's thick outer layer (zona pellucida) and fertilise it. Fertilisation occurs when the genetic material (deoxyribonucleic acid, DNA) in the sperm's head fuses with the egg's DNA to form a zygote. The egg then forms a barrier to other sperm. Coloured dark blue are the cumulus oophorus cells. These metabolically active cells provide the correct microenvironment for fertilisation.

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