A 25-year-old male athlete undergoes a cardiopulmonary exercise test. As exercise intensity increases from rest to moderate levels, which of the following best describes the relationship between oxygen consumption and cardiac output?
ALinear increase until anaerobic threshold
BExponential increase throughout exercise
CPlateau at low exercise intensities
DNo change until anaerobic threshold
Four days after undergoing an elective total hip replacement, a 65-year-old woman develops a DVT that embolizes to the lung. Along with tachypnea, tachycardia, and cough, the patient would most likely present with a PaO2 of what?
A120 mmHg
B100 mmHg
C85 mmHg
D110 mmHg
E60 mmHg
A 22-year-old man volunteers for a research study on lung function. He has no history of lung disease or allergies and does not smoke. His pulmonary blood flow is measured in the various labeled segments of the lungs while standing. Then the volunteer, still standing, is given very low continuous positive airway pressure and the blood flow measured again. Which of the following sets of findings are most likely to be present in the second measurements relative to the first?
AIncreased blood flow in zone 2
BReduced blood flow in zone 3
CReduced blood flow in zone 1
DIncreased blood flow in zone 3
EIncreased blood flow in zone 1
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