CONTROL OF THE HEARTBEAT
• The heart consists of muscle cells that
contract in waves. When the first group of
cells are stimulated, they in turn stimulate
neighboring cells.
• chain reaction continues until all the cells
contract
• Sinoatrial (SA) node
• located in the right atrium
• spontaneously initiate their own
electrical impulse and contract.
• atrioventricular (AV ) node
• located in the septum between the atria
• Control ventricle contraction