Multiple Choice
How would a decrease in blood volume affect both stroke volume and cardiac output?
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18. The Heart
Cardiac Action Potentials
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Ventricular depolarization is represented by which of the following on an electrocardiogram (ECG)?
A
P wave
B
T wave
C
U wave
D
QRS complex
Verified step by step guidance1
Understand the components of an electrocardiogram (ECG): The ECG is a graphical representation of the electrical activity of the heart. It consists of several waves, including the P wave, QRS complex, T wave, and sometimes a U wave.
Learn the significance of each wave: The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. The U wave is less commonly seen and its origin is not fully understood.
Focus on ventricular depolarization: Ventricular depolarization is the process by which the ventricles of the heart are electrically activated to contract and pump blood. This electrical activity is captured as the QRS complex on the ECG.
Understand the QRS complex: The QRS complex is typically a sharp, tall waveform that occurs after the P wave. It reflects the rapid electrical conduction through the ventricles, leading to their contraction.
Relate the QRS complex to the problem: Based on the information provided, ventricular depolarization is represented by the QRS complex on the ECG. This is the correct answer to the question.
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