Coloured SEM of Purkinje fibres and heart muscle

Coloured SEM of Purkinje fibres and heart muscle

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Credit: D. PHILLIPS/SCIENCE PHOTO LIBRARY

Caption: Coloured scanning electron micrograph showing Purkinje fibres (green) innervating on heart muscle fibres (red). 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 metres per second. Magnification: x300 at 35mm size.

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Keywords: anatomy, heart, heart muscle, human body, images, magnified image, microscopic photos, muscle, muscle fibre, muscles, purkinje, purkinje fibre, purkinje muscle fibres, subjects

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