Question

multiple choice question
heart rate is altered by stimulation of the sa node or the ________.

bundle branches

purkinje fibers

av node

av bundle

Explanation:

The sino - atrial (SA) node is the heart's natural pacemaker. The atrioventricular (AV) node also plays a role in regulating the heart rate by controlling the rate at which electrical impulses are transmitted from the atria to the ventricles. Bundle branches, Purkinje fibers, and the AV bundle are more involved in the conduction of electrical impulses for ventricular contraction rather than directly altering the heart rate like the SA and AV nodes.

Answer:

C. AV node