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An electrocardiogram (ECG) provides information about

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stroke volume

breathing rate

blood pressure

heart rate

answer is B.

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Detailed Solution

By counting the number of QRS complexes that occur in a given time period, one can determine the heart beat rate of an individual.

During a cardiac cycle, each ventricle pumps out approximately 70 mL of blood which is called the stroke volume.

Blood pressure is the measure of the force that our heart uses to pump blood around our body.

Breathing rate is the number of breathes taken by an individual per minute.

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