Question

Match the Column - I with Column - II.

	Column I		Column II
A	P-wave	1	Depolarisation of ventricles
B	QRS complex	2	Repolarisation of ventricles
C	T-wave	3	Coronary ischemia
D	Inversion of T-wave	4	Depolarisation of atria
		5	Repolarisation of atria

• A. A-2, B-3, C-5, D-4
• B. A-4, B-1, C-2, D-3
• C. A-4, B-1, C-2, D-5
• D. A-2, B-1, C-5, D-3

Answer 1

The correct option is B A-4, B-1, C-2, D-3

Electrocardiograph is a machine that produces an electrocardiogram (ECG).

ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. The ECG produces peaks and each peak is marked with a letter from P to T that corresponds to a specific electrical activity of the heart.

The P-wave represents the depolarisation of the atria, which leads to atrial contraction.

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

The T-wave represents the return of the ventricles from excited to normal state (repolarisation).

Inversion of the T-wave can be indicative of coronary ischemia.