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Sometimes, it can occur in highly trained athletes who have "high vagal tone," a condition that affects the SA node and slows the heartbeat.
RCA, LCA and their branches to SA node were dissected from their origin to termination.
The results of the research showed increased heart rate impairment, caused by a rise in streptozotocin on the SA node of the mice heart.
Its job is to conduct electricity in a rapid and organized fashion from the SA node to the AV node and then down through the lower conduction pathways to the ventricles.
Medical conditions that affect the SA node or the propagation of the contraction signal to the ventricles are the types of heart problems for which a pacemaker may be appropriate.
During periods when the SA node produces its own electrical signal, the pacemaker does nothing but monitor.
The research team point out that the way electrical signals are generated in the SA node - and hence the heart rate - are far from simple.
Electrical impulses from the SA node then travel through the heart muscle fibers.
Once generated by the SA node, the impulses spread in a coordinated fashion across the heart muscle in less than a quarter of a second.
When the heart beat is generated from the SA node the heart beats between 60-100 times per minute.
The SA node is the pacemaker of the heart, responsible for setting rate and rhythm.
Language Australia, Child ESL & Literacy Research SA Node Language Australia and the University of South Australia, Adelaide 1998, 225 pp.