STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Gut muscle cells, coloured transmission electron micrograph (TEM). Nuclei are pink. The involuntary contraction of this smooth muscle is responsible for peristalsis, the mechanism by which foodstuffs are propelled through the oesophagus and intestines. Magnification: x7000 when printed ten centimetres wide.
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