Human sperm

Human sperm

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Caption: Sperm. Coloured scanning electron micrograph (SEM) of human sperm (spermatozoa). These male sex cells are produced in the testes, and are responsible for fertilisation of the female's ovum (egg). 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: x3,000 at 5x7cm size.

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Keywords: anatomy, coloured, healthy, human body, human spermatozoa, images, magnified image, microscopic photos, normal, reproduction, reproductive system, scanning electron micrograph, sem, sperm, sperm cells, subjects, team, teams, teamwork, together, togetherness

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