In the presence of an acutely reduced arterial O2 content (hypoxemia), normal O2 delivery to the tissues can be maintained by which of the following?
a. Hyperventilation (increased VA)
b. Increased RBC production
c. Increasing the cardiac output
d. Peripheral vasoconstriction
ANS: C
Oxygen delivery (O2) to the tissues is a function of arterial O2 content (CaO2) times cardiac out-put (t):
O2 = CaO2 ⋅ t
If arterial O2 content falls an increased cardiac output will compensate.
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