
Cardiac Muscle, Sem #4 is a photograph by Science Photo Library which was uploaded on May 2nd, 2013.
Cardiac Muscle, Sem #4
Title
Cardiac Muscle, Sem #4
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Science Photo Library
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Photograph
Description
Cardiac muscle. Coloured scanning electron micrograph (SEM) of a bundle of healthy heart (cardiac) muscle fibrils (brown). Mitochondria (round, orange) supply the muscle cells with energy. The muscle fibrils, or myofibrils, are crossed by transverse tubules (vertical lines). These tubules mark the division of the myofibrils into contractile units (sarcomeres). Connective tissue, composed mainly of collagen, is seen at the top and bottom of the image. Cardiac muscle is under subconscious control and continuously contracts to pump blood around the body without tiring.
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May 2nd, 2013
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