Final answer:
One total heart beat on a rhythm strip is represented by the letters P-Q-R-S-T-U, corresponding to different phases of the cardiac cycle. In the given scenario, the time per beat during strenuous exercise would be approximately 0.4 seconds.
Step-by-step explanation:
One total heart beat on a rhythm strip is represented by the letters P-Q-R-S-T-U, which correspond to different phases of the cardiac cycle. These letters are used to analyze the electrical activity of the heart as recorded on an electrocardiogram (ECG). The P wave represents atrial contraction (systole), the QRS complex corresponds to ventricular depolarization (contraction), and the T wave represents ventricular repolarization (relaxation).
In the question provided, if the heart rate is 150 beats per minute, we can calculate the time per beat by dividing 60 seconds by the heart rate: 60 seconds / 150 beats per minute = 0.4 seconds per beat.
Therefore, during strenuous exercise, each heart beat would take approximately 0.4 seconds.