Exercise and cardiac output

• Cardiac output: • Maintains blood flow throughout the body. • Measure of blood volume ejected from the heart over a given time. • Determined by multiplying heart rate by stroke volume (CO = SV x HR). • Heart rate: Number of beats/min. • Stroke volume: Amount of blood ejected from the ventricles during one heartbeat. • Varies according to body's metabolic demands. • Increases dramatically during exercise. • Cardiac output during vigorous exercise can be as much as 20 L/min.

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