Home Biology Body Fluids and Circulation Cardiac Cycle and ECG In ECG, P-R interval corresponds to
Biology Body Fluids and Circulation Cardiac Cycle and ECG Single Correct MCQ
Published on: August 12, 2026

In ECG, P-R interval corresponds to

A
time delay in AV node
B
SA nodal conduction time
C
increased ventricular contraction
D
time interval between onset of ventricular contraction

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Text Solution

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Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart.

The P - wave represents the electrical excitation or depolarization of the atria.

The QRS complex represents the depolarization of the ventricles which initiates the ventricular contraction.

The contraction starts shortly after Q and marks the beginning of the systole.

The T- wave represents the return of the ventricles from excited to a normal state or repolarization.

The end of the T-wave marks the end of systole.

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