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Human sperm

Human sperm


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Human sperm

Sperm cells. Coloured scanning electron micrograph (SEM) of human sperm cells (spermatozoa). These tiny male sex cells are produced in the testes, and are responsible for fertilisation of the female egg (ovum). Each sperm has a rounded head which contains the male hereditary material (DNA) and a long whip-like tail that propels it along. Sperm production commences at puberty and is dependent on the male sex hormone testosterone. Some 300 million sperm are released by the male during ejaculation, while the female usually produces one large egg at a time. Only one sperm cell can fertilise the egg. Magnification unknown

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 6454593

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Re Production Reproductive System Sperm Sperm Cell Spermatozoa


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