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:

Zoology · Body Fluids and Circulation

NEET (UG) 2023 — Question 123

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:

The correct answer is option (4) as in a standard ECG, P-wave represents the electrical excitation

(or depolarisation) of the atria which leads to the contraction of both the atria.

• QRS complex represents the depolarisation of ventricles which initiates the ventricular contraction.

• T-wave represents the return of the ventricles from excited to normal state.

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