RESPIRATORY SYSTEM
ALVEOLI
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oxygen diffuses into the blood.
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Carbon dioxide diffuses out of the blood.
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Oxygen diffuses out of the blood.
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Carbon dioxide diffuses into the blood.
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Detailed explanation-1: -So, the correct answer is ‘Simple diffusion’
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: -Once the venous blood returns to the lungs, the carbon dioxide diffuses out of the bloodstream, through the capillaries, and into the alveoli from where it is expelled, during which time oxygen simultaneously binds with hemoglobin to be carried back to the tissues.
Detailed explanation-4: -The correct answer: The exchange of gases between the alveoli and the blood capillaries is called external respiration.
Detailed explanation-5: -Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.