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Fertilisation, SEM

K007/3966

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Credit

EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY

Caption

Fertilisation. Animated coloured scanning electron micrograph (SEM) of sperm (blue) attempting to penetrate a human egg (brown). Each sperm (spermatozoa) has a rounded head and a long tail with which it swims. Women usually release one egg (ovum) per month, whereas men release millions of sperm in each ejaculation. Only one of these sperm can penetrate the egg's thick outer layer (zona pellucida) and fertilise it. Fertilisation occurs when the sperm's genetic material (deoxyribonucleic acid, DNA) fuses with the egg's DNA. When this occurs the egg forms a barrier to other sperm.

Release details

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Clip Properties:

  • Duration: 00:00:15
  • Audio: No
  • Original Frame Size: 4000x4000
  • Interlaced: No
  • Capture Format: Digital Rostrum
  • Codec: JPEG

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