Cardiac muscle, TEM
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Cardiac muscle, TEM
Cardiac muscle. Coloured transmission electron micrograph (TEM) of cardiac muscle fibrils (pink)from a healthy heart. Mitochondria (blue) supply the muscle cells with energy. The muscle fibrils, or myofibrils, are crossed by transverse tubules (narrow dark red lines). These tubules mark the division of the myofibrilsinto contractile units (sarcomeres). In the centre is an intercalated disc (strong, undulating brownline). Intercalated discs are double membranes that separate adjacent cells in the muscle fibres. They facilitate synchronised contraction of the muscle. Cardiac muscle is under subconscious control and continuously contracts to pump blood around the body without tiring. Magnification: 3000x when printed 10 centimetres across
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6420350
© THOMAS DEERINCK, NCMIR/SCIENCE PHOTO LIBRARY
Cardiac Cardiology Continuous Fibre Fibril Fibrils Lines Micrograph Microscope Mitochondrion Muscles Myocardium Myofibril Myofibrils Organelle Organelles Pump Sarcomere Sarcomeres Transmission Electron Transmission Electron Micrograph Transverse Tubule Tubules Z Lines False Coloured
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