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Briefly explain why the R-R interval (and not the T-T interval) is used to calculate heart rate in this practical.

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Final answer:

The R-R interval is used to calculate heart rate because it represents the time between two consecutive R waves on an ECG tracing.

Step-by-step explanation:

The R-R interval is used to calculate heart rate in this practical because it represents the time between two consecutive R waves on an ECG tracing.

The R wave corresponds to the depolarization of the ventricles and is a clear and easily identifiable feature.

By measuring the time between consecutive R waves, we can determine the duration of one cardiac cycle and use it to calculate the heart rate.

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