Cardiac muscle

Cardiac muscle

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Caption: Cardiac muscle. Coloured scanning electron micrograph (SEM) of heart (cardiac) muscle fibrils (yellow). The membrane around the muscle has been torn (yellow). A vein (lower centre) has been damaged and a red blood cell can be seen emerging from the blood vessel. Mitochondria (red) supply the muscle cells with energy. The muscle fibrils, or myofibrils, are crossed by transverse tubules (thin lines). These tubules mark the division of the myofibrils into contractile units (sarcomeres). Cardiac muscle is under subconscious control and continuously contracts to pump blood around the body without tiring. Magnification: x1665 when printed 10cm wide.

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Keywords: anatomical, anatomy, biological, biology, blood vessel, cardiac, cardiology, cardiovascular, coloured, continuous, contractile unit, damage, damaged, false-colour, false-coloured, fibre, fibril, fibrils, heart, membrane, mitochondria, mitochondrion, muscle, muscles, myofibril, myofibrils, organelle, organelles, pump, rbc, red blood cell, sarcomere, sarcomeres, scanning electron micrograph, scanning electron microscope, sem, tear, torn, transverse, tubule, tubules, units, vein

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