Question

Which of the following is/are indicated by P-wave of ECG?

i. Depolarization of atrial muscles.

ii. Activation of SA-node.

iii. Spread of excitation from AV node to SA node.

iv. Repolarization of atria and depolarization of ventricles.

विकल्प

• i and iii

• i and ii

• ii and iv

• i, ii and iii

Answer 1

i and ii