Human sperm cell, SEM

Human sperm cell, SEM

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Credit: MANFRED KAGE/SCIENCE PHOTO LIBRARY

Caption: Sperm cell. Coloured scanning electron micrograph (SEM) of the head (lower left) and tail of a human sperm cell or spermatozoon. This tiny male sex cell is produced in the testes, and is responsible for fertilisation of the female egg (ovum). It has a rounded head which contains the male hereditary material (DNA), and a long tail that it uses to propel itself. Some 300 million sperm are released by the male during ejaculation, while the female usually releases one egg at a time. Only one sperm cell can fertilise the egg. Magnification unknown.

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Keywords: anatomy, coloured, gamete, human body, male, reproduction, reproductive system, scanning electron micrograph, sem, sperm, spermatozoa, spermatozoon

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