Which ECG wave represents atrial depolarization?

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Prepare for the Ivy Tech Anatomy and Physiology II (APHY 102) Heart Test with multiple-choice questions, detailed explanations, and study resources. Enhance your understanding and excel in your exam!

Multiple Choice

Which ECG wave represents atrial depolarization?

Explanation:
The P wave shows atrial depolarization. It reflects the electrical impulse spreading through the atria from the SA node, which triggers atrial contraction and pushes blood into the ventricles. The other waves represent different events: the QRS complex is ventricular depolarization (the main contraction of the heart), the T wave is ventricular repolarization (the ventricles resetting), and the U wave, when present, is a small, less consistently seen deflection not used to indicate atrial activity. So the first, small deflection on the trace corresponds to the atria depolarizing.

The P wave shows atrial depolarization. It reflects the electrical impulse spreading through the atria from the SA node, which triggers atrial contraction and pushes blood into the ventricles. The other waves represent different events: the QRS complex is ventricular depolarization (the main contraction of the heart), the T wave is ventricular repolarization (the ventricles resetting), and the U wave, when present, is a small, less consistently seen deflection not used to indicate atrial activity. So the first, small deflection on the trace corresponds to the atria depolarizing.

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