Which physiological adaptation does not happen at high altitudes?
APulmonary vasoconstriction
BRespiratory acidosis
CHypoxia
DPolycythemia
What is the most immediate hematological adaptation that occurs during high-altitude exposure to improve oxygen delivery to tissues?
AIncreased red blood cell mass
BReduced erythropoietin production
CIncreased white blood cell count
DIncreased 2,3-BPG levels
Which of the following is the MOST effective agent for prophylaxis of high-altitude pulmonary edema?
AACE inhibitor
BAcetazolamide
CNifedipine
DDigoxin
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