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    During a period of exercise the oxygen demand increased. It was necessary for the blood to deliver 10 cm3 of oxygen per minute per 100 g of respiring skeletal muscle.
     Oxygenated blood carries 20 cm3 of oxygen per 100 cm3.
     80% of the CO is directed at skeletal muscles when exercising heavily.
     Skeletal muscle accounts for 50% of lean body mass.
    a Calculate the volume of blood required to deliver sufficient oxygen to the muscles of a person weighing 108 kg during the exercise.
    b What is the required cardiac output to supply oxygen at this rate?
    c If the person had a heart rate of 193 bpm during the exercise, what would
    their stroke volume have been?
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