Question

Match List I with List II:

List I	List II
A. P - wave	I. Beginning of systole
B. Q - wave	II. Repolarisation of ventricles
C. QRS complex	III. Depolarisation of atria
D. T - wave	IV. Depolarisation of ventricles

Choose the correct answer from the options given below:

Options

• A - IV, B - III, C - II, D - I

• A - II, B - IV, C - I, D - III

• A - I, B - II, C - III, D - IV

• A - III, B - I, C - IV, D - II

Answer 1

A - III, B - I, C - IV, D - II

Explanation:

List I	List II
A. P - wave	III. Depolarisation of atria
B. Q - wave	I. Beginning of systole
C. QRS complex	IV. Depolarisation of ventricles
D. T - wave	II. Repolarisation of ventricles

The P wave in an ECG indicates atrial depolarisation. The Q wave indicates the start of systole. This is the initial deflection following the P wave and may not always be present. The QRS complex indicates ventricular depolarisation, which causes ventricular contraction. The T wave indicates ventricular repolarisation. This signifies the start of ventricular diastole.