20565B

20565B
Caption: Heart muscle with capillaries passing amongst the heart muscle fibers. Note the small varicose purkinje fiber adjacent to part of the capillary (green). 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*: x400
Type: SEM
Copyright 2001 Dennis Kunkel Microscopy, Inc.
Keywords: 20565B,human body,heart muscle,blood capillary,purkinje fiber,purkinje fibre,endothelia,endothelium,epithelial,epithelium,epithelia,muscle fiber,muscle fibre,muscles,circulatory system,SEM,cardiac muscle