Capillary with red blood cells, SEM

Capillary with red blood cells, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Capillary from heart muscle, 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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Keywords: 20520b, black and white, blood, blood capillary, capillaries, capillary, cardiac, cardiac capillary, cardiac muscle, circulatory system, endothelia, endothelium, epithelia, epithelial, epithelium, erythrocyte, erythrocytes, haemoglobin, heart, heart capillary, heart muscle, hemoglobin, human, human blood, human body, human capillary, medical, medicine, monochrome, muscle fibre, muscle fibres, purkinje fibre, purkinje fibres, red blood cell, red blood cells, scanning electron micrograph, sem

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