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Heart valve tendons, SEM

Heart valve tendons, SEM

P216/0355

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Credit

STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY

Caption

Heart valve tendons. Coloured scanning electron micrograph (SEM) of the chordae tendineae, tendons which attach the atrioventricular heart valves to their muscles. These valves prevent blood being forced back into the atria (upper heart chambers) from the ventricles (lower heart chambers) during the contraction of the ventricles. The right ventricle (which pumps deoxygenated blood to the lungs) is separated from the right atrium by the tricuspid valve. The left ventricle (which pumps newly-oxygenated blood around the body) is separated from the left atrium by the mitral valve. The valves are controlled by papillary muscles (not seen). Magnification unknown.

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