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metal prints human body metal prints heart muscle metal prints blood capillary metal prints red blood cell metal prints erythrocyte metal prints red blood cells metal prints endothelia metal prints epithelial metal prints epithelium metal prints epithelia metal prints circulatory system metal prints muscle fibre metal prints cardiac muscle metal prints sem metal prints scanning electron micrograph metal prints

photographs human body photos heart muscle photos blood capillary photos red blood cell photos erythrocyte photos red blood cells photos endothelia photos epithelial photos epithelium photos epithelia photos circulatory system photos muscle fibre photos cardiac muscle photos sem photos scanning electron micrograph photos

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Capillary from heart muscle, coloured scanning electron micrograph (SEM). Red blood cells are tightly packed in the capillary. Note the small Purkinje fibre on the surface of the capillary. 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: x800 when shortest axis printed at 25 millimetres.

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