Which of the following is a FALSE statement regarding hemodynamic changes occurring during exercise?
AVenous return is augmented by the pumping action of skeletal muscles.
BEnd-diastolic volume increases in the failing heart during exercise.
CVenoconstriction in exercising muscles as well as increased cardiac output leads to marked increase in systemic blood pressure.
DThe increased adrenergic nerve impulses to the heart as well as an increased concentration of circulating catecholamines help to augment the contractile state of the myocardium.
During exercise the cardiac output rises up to 5 times, but the rise in pulmonary vascular resistance is only a few mm Hg. Why?
ASympathetic stimulation causing vasodilatation
BPulmonary vasoconstriction
COpening of parallel channels
DJ receptors
Which of the following parameters is most critical for maintaining optimal oxygenation?
AFiO2
BRespiratory rate
CPEEP
DTidal volume
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