Click a Graphic ____ to Select It

question 4

Multiple Choice

Click a graphic ____ to select it.

• A) once
• B) twice
• C) three times
• D) four times

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Definitions:

P Wave

A component of an electrocardiogram (ECG) representing the depolarization of the atria preceding a heartbeat.

Sinoatrial Node

The heart's natural pacemaker, located in the right atrium, responsible for initiating the heartbeat.

Wave of Depolarization

A rapid change in electrical charge across a cell membrane, leading to nerve impulse transmission or muscle contraction.

QRS Complex

A portion of an electrocardiogram (EKG) representing the depolarization of the heart's ventricles, preceding the ventricular contraction.