Question

c) pulmonary arteries
d) aorta
question 7 (2 points)
the _____ sends out an electrical impulse that begins and regulates the
a) ipurkinje fibers
b) av node
c) av bundle
d) sa node

Explanation:

The sino - atrial (SA) node is known as the natural pacemaker of the heart. It initiates and regulates the heartbeat by sending out electrical impulses. The Purkinje fibers conduct the electrical impulses for ventricular contraction after the signal has passed through other parts of the conduction system. The atrioventricular (AV) node delays the electrical impulse slightly to allow the atria to contract before the ventricles, and the AV bundle (bundle of His) is part of the conduction pathway from the atria to the ventricles.

Answer:

d) SA node