Fertilisation is a photograph by Clouds Hill Imaging Ltd/science Photo Library which was uploaded on October 7th, 2018.
Fertilisation
Fertilisation. Coloured scanning electron micrograph (SEM) of a sperm cell (blue) penetrating a human egg (ovum). Each sperm (spermatozoan) has a... more
Title
Fertilisation
Artist
Clouds Hill Imaging Ltd/science Photo Library
Medium
Photograph
Description
Fertilisation. Coloured scanning electron micrograph (SEM) of a sperm cell (blue) penetrating a human egg (ovum). Each sperm (spermatozoan) has a rounded head (acrosome) and a long tail with which it swims. Women usually release one egg per month, whereas men release millions of sperm in each ejaculation. Only one of these sperm can penetrate the egg's thick outer layer (zona pellucida) and fertilise it. Fertilisation occurs when the sperm's genetic material (deoxyribonucleic acid, DNA) fuses with the egg's DNA. When this occurs the egg forms a barrier to other sperm.
Uploaded
October 7th, 2018
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