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Heart muscle with purine fibres, SEM

Heart muscle with purine fibres, SEM

C031/9794

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Credit

DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY

Caption

Heart muscle with purine fibres on the surface of the heart muscle fibres, coloured scanning electron micrograph (SEM). Purkinje fibres are modified cardiac muscle fibres which originate from the atrioventricular node and spread into the two ventricles. They transmit the electrical impulse from the atrioventricular node to the ventricles enabling their almost simultaneous contraction. The spread of excitation through the ventricles from the atrioventricular node is extremely rapid, moving at one to four meters per second. Magnification: x700 when shortest axis printed at 25 millimetres.

Release details

Model release not required. Property release not required.

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