What is an approximate normal resting cardiac output for a healthy adult?
a. 75 ml/min
b. 500 ml/min
c. 2000 ml/min
d. 5000 ml/min
ANS: D
A normal resting cardiac output of approximately 5 L/min can be calculated by substituting a normal heart rate (70 contractions/min) and stroke volume (75 ml, or 0.075 L, per contraction).
Cardiac output = 70 beats/min ? 0.075 L/beat = 5.25 L/min.
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