Gatekeeper of the heart is:: (A) SA node, (B) AV node, (C) Purkinje fibers, (D) Bundle of His
Answer is B. “The AV node is located on the floor of the right atrium. It has an intrinsic firing rate of 40-60 beats per minute. It is known as the gatekeeper of the heart, because it regulates impulses coming from the SA node.”