One scientist established a technique that could map the pathways of oxygen move

Question

One scientist established a technique that could map the pathways of oxygen movement in human body. When he traced the movement of oxygen molecules, he found two facts in normal healthy people: (1). Some oxygen molecule (O2 ) was inhaled into the lung, but never make up its way to reach the heart; (2). Some oxygen molecules (O2) could pass through the heart more than ten times after entering the blood.

4a. Explain how and why (1) happened (4 points).

4b. Explain why and how (2) happened (4 points).  

Explanation / Answer

4a) The primary function of the respiratory system is to transfer oxygen in and carbondioxide out to the body. some molecules was inhaled into lungs not into the heart because as follows

4b) Oxygenated blood travels from the lungs through the pulmonary veins and into the left side of the heart without entering the alveoli of lungs

Oxygenated blood travels from the lungs through the pulmonary veins

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