Caption: Capillary from heart muscle. Red blood cells are tightly packed in the capillary. Note the small Purkinje fiber 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 metres per second.
Magnification*: x800
Type: SEM
Copyright 2001 Dennis Kunkel Microscopy, Inc.
Keywords: 20520A,human body,heart muscle,blood capillary,purkinje fiber,purkinje fibre,red blood cell,erythrocyte,red blood cells,endothelia,endothelium,epithelial,epithelium,epithelia,circulatory system,muscle fiber,muscle fibre,muscles,cardiac muscle,SEM