Questions: Which of the following describes a complete cardiac cycle in a healthy heart? P wave, QRS complex, and T wave

Which of the following describes a complete cardiac cycle in a healthy heart? P wave, QRS complex, and T wave
Transcript text: Which of the following describes a complete cardiac cycle in a healthy heart? P wave, QRS complex, and T wave
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Solution

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The answer is the second one (B): P wave, QRS complex, and T wave.

Explanation for each option:

A. P wave, Q wave, and ST segment: This option is incorrect because it does not include the complete QRS complex, which is essential for describing the depolarization of the ventricles. The ST segment is part of the cardiac cycle but does not complete the cycle on its own.

B. P wave, QRS complex, and T wave: This option is correct. The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. Together, these components describe a complete cardiac cycle in a healthy heart.

C. P wave, QRS complex, and QT interval: This option is incorrect because the QT interval is a measurement of time from the start of the Q wave to the end of the T wave, rather than a distinct part of the cardiac cycle. It does not describe the cycle itself.

D. P wave, QRS complex, and P wave: This option is incorrect because it suggests a repetition of the P wave without including the T wave, which is necessary to complete the cycle.

In summary, the complete cardiac cycle in a healthy heart is best described by the P wave, QRS complex, and T wave.

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