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Free notes, MCQs, tables & flowcharts for USMLE Step 2 CK Physiology
A 24-year-old professional athlete is advised to train in the mountains to enhance his performance. After 5 months of training at an altitude of 1.5 km (5,000 feet), he is able to increase his running pace while competing at sea-level venues. Which of the following changes would produce the same effect on the oxygen-hemoglobin dissociation curve as this athlete's training did?
ADecreased 2,3-bisphosphoglycerate
BIncreased carbon monoxide inhalation
CDecreased temperature
DDecreased pH
EIncreased partial pressure of oxygen
A healthy 20-year-old male college student attempts to climb Mount Everest and travels to the Tibetan plateau by plane. Upon landing, he feels increasingly dizzy and fatigued. He notices that he is breathing faster than usual. What is the initial stimulus for the most likely acid-base disorder?
ADecreased partial pressure of alveolar oxygen
BUndiagnosed atrial septal defect
CIncreasing arterial partial pressure of carbon dioxide
DWorsened diffusion limitation of oxygen
EHypoxic pulmonary vasoconstriction
A 34-year-old woman comes to a physician for a routine health maintenance examination. She moved to Denver 1 week ago after having lived in New York City all her life. She has no history of serious illness and takes no medications. Which of the following sets of changes is most likely on analysis of a blood sample obtained now compared to prior to her move? Erythropoietin level | O2 saturation | Plasma volume
A↑ unchanged unchanged
B↑ ↓ ↓
CUnchanged ↓ unchanged
D↓ unchanged ↑
EUnchanged unchanged ↓
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