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Fertilization
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Fertilization
Fertilization. Computer artwork of one of a group of human sperm (spermatozoa) successfully penetrating an egg (ovum). Only one sperm can penetrate the eggs thick outer layer (zona pellucida) and fertilize it. Fertilization occurs when DNA (deoxyribonucleic acid) released by the sperm fuses with DNA contained in the egg. Women produce a single egg at a time, whilst men release around 500 million sperm. The sperm use their flexible tails to travel through the female reproductive tract. Only a few thousand sperm reach the egg, which is located in one of the Fallopian tubes
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6453769
© DAVID MACK/SCIENCE PHOTO LIBRARY
Beginning Beginnings Circle Circles Fertilization Fertilizing Gamete Gametes Germ Cell Journey Journeying Journeys Motion Action Move Movement Moving Moving Ovum Penetrating Propelling Reproductive System Round Shape Rounded Circular Sexual Reproduction Sperm Spermatozoa Spermatozoon Swimming Tail Tails Travel Travelling Travels Zona Pellucida Cells Computer Artwork
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