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Sinoatrial node
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∙ 11y ago
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What two structures directly receive an electrical impulse from the sinoatrial node?
Only one receives the signal from the SA Node and that is the A-V node.There are specialized areas of cardiac muscle tissue (1%) in the heart that are autorhythmic (self-exciting). These cells compose the CCS and are responsible for initiating and distributing cardiac (electrical) impulses throughout the heart muscle (i.e. cause the heart to beat). These specialized areas together coordinate the events of the cardiac cycle, which makes the heart an effective pump.A. Components of CCS:1. Sinoatrial Node (S-A Node):located in right uppermost atrial wall and called the PACEMAKER = self-exciting tissue (rhythmically and repeatedly [60-100 per minute] initiates cardiac impulses)2. Atrioventricular Node (A-V Node): located in interatrial septum; serves as a delay signal that allows for ventricular filling. This one will act as a back up pacemaker if needed. It is also called the Bundle of His.3. Right and left bundle branches lead downward through interventricular septum toward apex, and impulse finally reaches...4. Purkinje Fibers (Conduction Myofibers), large diameter conduction myofibers; located within the papillary muscles of the ventricles; conduct the impulse into the mass of ventricular muscle tissue.
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Which of the following heart structures is self exciting tissue?
sinoatrial node of the heart.
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# Cardiac muscle tissues such as the sinoatrial node are self exciting. This is because they do not rely on any outside resources to stimulate the heart. This is what gives the heart the pace making rhythm and keeps the heart beating.
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