Atrial function right

... ) To examine glossopharyngeal and vagus nerve function, the physician tests for the presence of ... depresses the rate of impulse formation and atrial contractility and thereby reduces cardiac ... together with the esophagus, branches of the right vagus nerve spread over the posterior part ...

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... (or action potentials) that trigger cardiac contraction, the sinoatrial node is what normally initiates it, simply because it generates impulses ... it is sometimes called the primary pacemaker. If the SA node doesn't function, or the impulse generated in the SA node is blocked before it travels ...

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