Pls ans dudes...

Pls ans dudes... 14. Which of the following best describes the process of gas exchange in the lungs? a. Air moves in and out of the alveoli during breathing. b. Carbon dioxide diffuses from deoxygenated blood in capillaries into the alveolar air. c. Oxygen and carbon dioxide diffuse down their concentration gradients between blood and alveolar air. d. Oxygen diffuses from alveolar air into deoxygenated blood. v. re (c (d 17.N 18.

Dear Student,
Please find below the solution to the asked query.

The answer to your question is option c.

The process of gas exchange in our body involves diffusion of gases i.e. oxygen and carbon dioxide will move across the alveolus and blood capillaries along their concentration gradient ( from region of higher concentration to the region of lower concentration). As we inhale, the lungs get filled with oxygen rich air. This O​​​​​2 will diffuse from the alveolus (high concentration) into capillaries (low concentration) that will carry the oxygenated blood via pulmonary vein to the heart and from there it gets pumped to the body. When the tissues utilize this oxygen for oxidation of food to liberate energy, water and CO​​​​​2 , the deoxygenated blood from the body parts are carried by Vena Cava to the heart and from heart it reaches lungs via pulmonary artery. In lungs, the alveolus and the capillaries exchange CO​​​​​2. There is diffusion of CO​​​​​2 from capillaries (High Concentration of CO​​​​​2) to alveolus (low concentration of CO​​​​​2 ), leading to exhalation of CO​​​​​2 rich air from the lungs.

Out of the four option, only option c best describes the process of gas exchange in the lungs. The rest of the options only describe a part of the above discussed process.
Hope this information will clear your doubts.
Regards

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The correct explanation will be option c as capillaries bring deoxygenated blood to alveoli where its concentration is less and so the co2 in blood diffuses to alveoli and the oxygen is present in higher concentration in the alveolar air and hence diffuses into the blood capillaries 
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the answer is c
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