Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
P-wave of ECG indicates (1) depolarization of atrial muscles (2) activation of SA-node (3) spread of excitation from SA node to AV node (4) repolarization of atria and depolarization of ventriclesA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
A normal ECG (Electrocardiogram) consists of a P wave, a QRS complex and a T wave. The first wave, called P wave is a small upward deflection causes atrial depolarization and activation of SA-node (Sino-Atrial node). QRS complex is related to ventricular systole while T wave indicate ventricular repolarization.
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