Which of the following are potential causes of hypoxia? 1. Decrease in arterial PO2 2. Decrease in available Hb 3. Decrease in cardiac output
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: D
Hypoxia occurs if (1) the arterial blood O2 content is decreased (hypoxemia), or (2) cardiac out-put or perfusion is decreased (shock or ischemia).
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