THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY
Cardiac muscle. Coloured transmission electron micrograph (TEM) of cardiac muscle fibrils (pink and blue)from a healthy heart. The muscle fibrils, or myofibrils, are crossed by transverse tubules (dark blue lines). These tubules mark the division of the myofibrilsinto contractile units (sarcomeres). Cardiac muscle is under subconscious control and continuously contracts to pump blood around the body without tiring. Magnification: 3900x when printed 10 centimetres across.
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