DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Umbilical cord. Light micrograph of a section through an umbilical cord showing on of the two umbilical arteries (yellow and red). Surrounding connective tissue is pink. The umbilical cord is the tube that connects a developing foetus to the placenta inside a mother's womb. It brings oxygen and nutrition to the developing foetus, and takes away waste products. Magnification: x4 when printed at 10 centimetres wide.
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