How many liters of blood are distributed between the pulmonary and systemic circuits in a "typical" person? Assume 20% of the blood is in the lungs at any moment. If the cardiac output is 5 L/min, how long will it take a drop of blood to flow from the right ventricle to the left ventricle?

What will be an ideal response?


There are about 5 liters of blood in a 70 kg man. If 20% of the blood is in the lungs, then 5 × 0.2 = 1 liter of blood in the lungs.
1 L × 1 min/5 L × 60 sec/1 min × 1 min/60 sec = 12 seconds.

Anatomy & Physiology

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