Fertilisation. Computer artwork of human sperm approaching, and one sperm penetrating, an egg (ovum, pink) at fertilisation. The sperm have an oval he

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Fertilisation. Computer artwork of human sperm approaching, and one sperm penetrating, an egg (ovum, pink) at fertilisation. The sperm have an oval head and a hair-like tail which they beat with a whiplash motion to swim. The human female usually produces a single large egg from the ovary, while the male releases some 300 million much smaller sperm. The sperm travel through the uterus (womb) and up the fallopian tubes to reach the egg. The sperm must penetrate a thick layer around the egg; this penetration is aided by enzymes contained in the sperm's head. Only one sperm can fuse with the egg nucleus. Fertilisation enables male and female genes to be shared.

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Size: 3753px × 4772px
Photo credit: © MEHAU KULYK/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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