Question

The electrical origin of inverted P waves in lead II is in the:

		Ventricles
		Lower atria
		SA node
		Bundle of His

Answer 1

The correct answer is

The electrical origin of inverted P waves in lead ll is in the lower atria.

P waves from the atria are usually inverted. if the P wave is inverted, it is most likely an ectopic atrial rhythm not originating from the sinus node.

The remaining answers are worng

There are 3 main components in an ECG, the P wave represents the depolarization of the atria, the QRS complex represents the depolarization of ventricles and T wave represents the repolarization of the ventricles.

Sino atrial node creates an action potential that depolarizes the atria.

The bundles of His helps the wave impulses along the ventricles causing them to contract.