ANIMAL PHYSIOLOGY
GAS EXCHANGE IN DIFFERENT ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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carbon dioxide passes into the alveoli from the capillaries
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carbon dioxide passes into the bloodstream from the alveoli
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oxygen passes into the alveoli from the bloodstream
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none of the above
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Detailed explanation-1: -(b) In the alveoli, exchange of gases takes place, i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air.
Detailed explanation-2: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Detailed explanation-3: -Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
Detailed explanation-4: -So, the correct answer is ‘Gases are passively transported across the respiratory surfaces’.
Detailed explanation-5: -Final answer: The exchange of gases in the alveoli of the lungs takes place by simple diffusion.