Heart muscle, light micrograph

Heart muscle, light micrograph

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Credit: ASTRID & HANNS-FRIEDER MICHLER/SCIENCE PHOTO LIBRARY

Caption: Heart muscle. Light micrograph of a longitudinal section through cardiac (heart) muscle. This section is from a papillary muscle of the heart. Cardiac muscle consists of branching elongated muscle cells, called myocytes, which form fibres (running horizontally). The myocytes are separated by intercalated discs (purple vertical lines), which allow electrical signals to travel rapidly between myocytes. Myocytes consist of microfilaments of the contractile proteins actin and myosin and a centrally located nucleus (purple, round). Cardiac muscle is myogenic, it can cause its own contraction without any other input.

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Keywords: actin, anatomical, anatomy, biological, biology, brilliant black, cardiac, cardiology, contractile unit, discs, healthy, heart, histological, histology, human body, intercalated disc, light micrograph, light microscope, longitudinal, microfilaments, muscle, myocardium, myocyte, myocytes, myofibril, myofibrils, myogenic, myosin, normal, papillary muscle, safranin, sarcomere, sarcomeres, section, sectioned, stain, stained, striated

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