Question

Regulation and initiation of heartbeat is indicated by:

• A. AV node – bundle of His muscle – SA node – Purkinje fiber
• B. SA Node – Purkinje fiber – AV Node – Bundle of His muscle
• C. Purkinje fiber – AV Node – SA Node – Bundle of His muscle
• D. SA Node – AV Node – Bundle of His muscle – Purkinje fiber

Answer 1

The correct option is D SA Node – AV Node – Bundle of His muscle – Purkinje fiber

The initiation of heart beat is triggered by SA node which is located right upper corner in right atrium, which will be travel through AV node which is present near the atrioventricular
septum. From here, impulses travel to ventricle through bundle of His and finally in Purkinje fiber, which is terminal branching of bundle of His.