Mammalian Cell Biology, Human Anatomy and Physiology · Circulatory System · 2 marks · Multiple choice
A person has 5 L blood: 4 L in systemic circulation and 1 L in pulmonary circulation. Cardiac output is 5 L/min. Find the transit time for a drop of blood from right ventricle to left ventricle in seconds under this average-flow model.
The right-to-left-ventricle route passes through the pulmonary circulation, with one litre of contained blood. Mean transit time=volume/flow=1/(5 L/min)=.2 min. Multiplying by sixty gives twelve seconds, D. Using the full five-litre volume would incorrectly include systemic transit.
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