Heartbeat is normally regulated by:
Correct answer: C. Sinoatrial node
- A. Purkinje fibers
- B. AV bundle
- C. Sinoatrial node
- D. Bundle of His
Explanation
The impulse starts in a small bundle of specialised cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles. The SA node sets the rate and rhythm of your heartbeat.
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About Cardiac Cycle and Heartbeat
The cardiac cycle describes atrial systole, ventricular systole and diastole, including pressure changes, blood movement and the opening or closing of heart valves. It also covers the conduction pathway from the sinoatrial node through the atrioventricular node, bundle of His and Purkinje fibres, and relates these events to heartbeat sounds.
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