MICROSCAPE / SCIENCE PHOTO LIBRARY MICROSCAPE / SCIENCE PHOTO LIBRARY
Cardiac muscle. Light micrograph of a section through muscle tissue from a heart, showing the cardiomyocyte cells. Heart muscle cells show central nuclei but the dominant feature is the abundance of deeply-stained mitochondria (dark spots) that supply the energy required for life-long cell contractions. Cardiomyocytes are branched and the heart tissue has a rich vascular supply seen here as many capillaries. Magnification: x200 when printed 10 centimetres wide.
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