This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
At rest what amount of oxygen is transferred from blood to tissue 
Select and explain. 
A. 250 ml/min, B. 500 ml/min, C. 750 ml/min, D. 1000 ml/min
A: 250 ml/min
Answer: A: 250 ml/min 
Explanation: At rest the tissues remove about 4.6 mL of O2 from each deciliter of blood passing through them 0.17 mL of this total represents O2 that was in solution in the blood, and the remainder represents O2 that was liberated from hemoglobin. In this way, 250 mL of O2 per minute is transpoed from the blood to the tissues at rest.