SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Umbilical cord. Coloured scanning electron micrograph (SEM) of a human umbilical cord, showing a blood vessel (purple/red). The umbilical cord is the attachment connecting the foetus with the placenta, and by which the foetus receives nourishment from the mother's blood.
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