Which of the following equations best describes O2 delivery to the tissues?
a. Arterial O2 content ÷ cardiac output
b. Arterial O2 content ? cardiac output
c. Cardiac output + arterial O2 content
d. Cardiac output ? vascular resistance
ANS: B
Oxygen delivery (DO2) to the tissues is a function of arterial oxygen content (CaO2) times cardi-ac output (t):
O2 = CaO2 ⋅ t
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