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Regarding circulatory adjustments during exercise which of the following is correct?

A)  The cardiac output increases more than tenfold in severe exercise.

B)  The increase in cardiac output during exercise is mainly due to an increase in stroke volume.

C)  The increase in stroke volume seen in exercise occurs despite a smaller end-diastolic volume.

D)  In severe exercise the mean arterial pressure is unchanged because diastolic pressure falls.