HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY
Foetus and placenta. Illustration of a human foetus (right) in its amniotic sac, with the umbilical cord and placenta (left). The umbilical cord connects the foetus to the placenta, through which it receives nutrients and where blood gases are exchanged. The placenta has been sectioned to show its blood vessel anatomy and the intermeshing of the two capillary networks. In humans, the foetus develops for around 9 months, and is born after around 38 weeks of development in its mother's uterus.
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