POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Sperm. Coloured scanning electron micrograph (SEM) of human sperm (spermatozoa), the male sex cells. These male gametes are produced by the testes. They deliver genetic material, contained in their oval heads, to the ovum (female gamete), using their tails to swim through the female reproductive system. Normally, only one sperm in the 300 million that are ejaculated will fertilise the ovum. Magnification unknown.
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