Health Education Systems Admission Assessment HESI Quiz
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ANATOMY AND PHYSIOLOGY
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An athlete's electrocardiogram shows a PR interval of 0.24 seconds (normal: 0.12-0.20 seconds) and a heart rate of 45 beats per minute. During exercise, the heart rate increases to 180 beats per minute with the PR interval decreasing to 0.16 seconds. What best explains this physiological response?
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