Cardiac muscle, SEM

Cardiac muscle, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Cardiac muscle. Coloured scanning electron micrograph (SEM) of cardiac muscle fibrils (blue) from a healthy heart. Mitochondria (round, yellow) supply the muscle cells with energy. The muscle fibrils, or myofibrils, are crossed by transverse tubules (horizontal 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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Keywords: anatomical, anatomy, biological, biology, cardiac, cardiology, cardiovascular, collagen, coloured, connective tissue, continuous, contractile unit, false-colour, false-coloured, fibre, fibril, fibrils, healthy, heart, human body, images, intercellular collagen network, magnified image, microscopic subjects, mitochondria, mitochondrion, muscle, muscles, myofibril, myofibrils, normal, organelle, organelles, pump, sarcomere, sarcomeres, scanning electron micrograph, scanning electron microscope, sem, transverse, tubule, tubules, units, z-lines

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