Sperm cell fertilising an ovum, artwork

Sperm cell fertilising an ovum, artwork

C016/8743 Rights Managed

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Credit: JOHN BAVOSI/SCIENCE PHOTO LIBRARY

Caption: Sperm cell fertilising an ovum, artwork. Each sperm (spermatozoan, three shown) has a rounded head and a long tail which it uses to both swim and burrow into the egg. 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 (upper right) forming a zygote. The egg then forms a barrier to other sperm.

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Keywords: anatomical, anatomy, artwork, biological, biology, cell, cell nucleus, cell surface, cells, cellular, close-up, conceive, conceived, conceiving, conception, deoxyribonucleic acid, detail, dna, egg cell, female, fertilisation, fertilise, fertilising, fertilization, fertilize, gamete, genetic material, healthy, human body, illustration, male, membrane, normal, outer layer, ovum, penetrating, physiological, physiology, reproductive system, sex cell, sexual reproduction, sperm cell, spermatozoa, spermatozoan, zona pellucida, zygote formation

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