Artwork of a human sperm fertilising an egg

Artwork of a human sperm fertilising an egg

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Credit: EDELMANN/SCIENCE PHOTO LIBRARY

Caption: Sperm fertilising egg. Artwork of a sperm (lower centre) fertilising a human egg. Women usually produce one large egg (ovum), whereas men release some 300 million much smaller sperm (spermatozoa) which travel with whiplash movements of their tail through the uterus to reach the egg. A few hundred sperm survive this journey and encounter the egg in the fallopian tube. However, only one sperm manages to penetrate the egg's thick outer layer (zona pellucida, clear) using enzymes, and fertilises the egg by fusing with its DNA genetic material. When this occurs, the egg membrane forms a barrier to other sperm.

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Keywords: anatomy, ar, art, artwork, egg, egg and sperm ar, egg surface, fertilisation, fertilization, human, human body, in human fertilisation, ovum, reproduction, sperm, spermatozoa, zona pellucida

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