In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
A: In ECG by counting the number of QRS complexes, that occur in a given time period, one can determine the heart beat rate of an individual.
R: The QRS complex represents the depolarization of the ventricles which initiate the ventricular contraction.