HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Small intestine, light micrograph. At left are layers of muscle that contract and relax to move food through the small intestine. The small intestine is where digestion begins and nutrients are absorbed into the blood. Magnification: x280 when printed at 10 centimetres wide.
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