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The average adult body contains about 5 liters of blood. This means that all of our blood is rotated through our body once every minute or so. The idea of “cardiac output” is an important concept in understanding this phenomenon. It is possible to calculate cardiac output by knowing which two values?
  1. Heart rate and stroke volume
  2. Stroke volume and VO2
  3. Stroke volume and oxygen debt
  4. Heart rate and ejection fraction
Explanation
Answer: A - Cardiac output can be calculated by knowing two numbers: heart rate and stroke volume. In order to determine the total volume of blood pushed through the system in a minute, you would multiple heart rate (how many times the heart compresses each minute) times stroke volume (how much blood is pushed). The concept of ejection fraction is related to cardiac output, but not directly. Ejection fraction is basically a measure of how much blood is pushed… and how much is left lingering in the heart
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