Discussion
What is the function of the sinoatrial (SA) node in the heart?
Answer: B
The SA node acts as the pacemaker of the heart.
The sinoatrial node, a small mass of specialised muscle in the wall of the right atrium, fires electrical impulses on its own at about 60 to 100 per minute, faster than any other part of the conducting system. Each impulse spreads over the atria and then through the AV node to the ventricles, so the SA node sets the heart rate.
Blood pressure is regulated by the nervous and hormonal systems acting on the heart and vessels. Valves open and close passively with pressure changes, and blood is pumped by the contraction of the ventricular muscle, not by the node.
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