Question

Upon vigorous exercise, your heart rate increases to 200 beats per minute to supply sufficient oxygen to muscles. Which is responsible for this regulation of the heart rate? A. Semilunar valves
B. Sinoatrial node
C. Aorta

Answer 1

I think the correct answer from the choices listed above is option B. The one that is responsible for the regulation of the heart rate is the sinoatrial node. It is the heart's peacemaker. It is a specialized bundle of neurons which controls the cardiac function. Hope this answers the question.

Answer 2

Answer:

The correct answer would be option B.

Sinoatrial node is also known as heart's pacemaker as it controls the heart rate.

It consists of cluster of cells in upper region of the right atrium. These cells generate electrical signals which are passed onto atrioventricular node.

It is the cluster of cells which is located at the centre of the heart.

It passes and slows down the electric signals to the ventricles.