Coloured SEM of egg & sperm during fertilisation

Coloured SEM of egg & sperm during fertilisation

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Credit: PROFESSOR P.M. MOTTA ET AL/SCIENCE PHOTO LIBRARY

Caption: Fertilisation. Coloured Scanning Electron Micro- graph (SEM) of a human egg (ovum) being penetrated by sperm during fertilisation. Sperm are coloured yellow, each with a rounded head and a long tail. They are seen on the thick spongy surface of the zona pellucida which surrounds the egg. The zona pellucida attracts sperm to the egg and enables the sperm to attach. The human female usually produces a single large egg, and only one male sperm can penetrate the egg's wall to fuse with the egg nucleus. When this happens, the egg membrane forms a barrier to any other sperm. Magnification: x960 at 6x7cm size. x1,260 at 4x5".

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Keywords: anatomy, egg, egg and sperm, fertilisation, fertilization, human, human body, human fertilisation, in fertilisation, oocyte, ovum, reproduction, sperm, zona pellucida

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