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Q.

How does oxygen enter the blood in the lungs?

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a

By diffusion through the alveoli walls

b

By active transport through the alveoli walls

c

By filtration through the alveoli walls

d

By osmosis through the alveoli walls

answer is A.

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Detailed Solution

Oxygen diffuses from the alveoli, where it is inhaled, into the capillaries surrounding the alveoli. This occurs due to the concentration gradient of oxygen, with a higher concentration of oxygen in the alveoli compared to the capillaries. Oxygen then enters the red blood cells, where it is bound to hemoglobin and transported to the body's tissues.

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