Question

Damage to the sinoatrial node in humans would ________. A. block conductance between the bundle branches and the Purkinje fibers B. have a negative effect on peripheral resistance C. disrupt the rate and timing of cardiac muscle contractions D. have a direct effect on blood pressure monitors in the aorta

Answer 1

The correct answer is option C. disrupt the rate and timing of cardiac muscle contractions.

Muscle contractions is the primary function of the SA node is to regularly stimulate the atrium with electrical impulses so that it will contract and pump blood into the ventricle. Any harm to the SA node will cause the heart to contract or pump abnormally, and the rhythm will also be disturbed.

   Sinoatrial node damage will alter the sinus rhythm of the heart, but Atrioventricular node damage will cause the heart to begin contracting because it also contains pacemaker cells. This is referred to as the heart's idiopathic rhythm. As a result, it will interfere with the rate and timing of cardiac conductance, preventing heart attacks as well as having no impact on peripheral resistance, conductance between purkinje fibers and bundle branches, or aortic blood pressure.

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