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Circulatory system
How much blood does the normal human heart pump into the arteries with each contraction?
Explanation and memory cue
The question asks about the volume of blood pumped by the human heart with each contraction, which is known as the stroke volume and is typically measured in milliliters (mL), not centimeters (cm). The average stroke volume is about 70 mL, so none of the given options with units in cm are correct. Therefore, 'None of these' is the correct answer.