The figure given below shows a small part of human lung where exchange of gases takes place. In ...

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The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part \( \mathbf{P}, \mathbf{Q}, \mathbf{R} \) or \( \mathbf{S} \) is correctly identified along with its function.
img title=Screenshot 2023-04-20 101845.png src=https://d2bps9p1kiy4ka.cloudfront.net/5b09189f7285894d9130ccd0/yp6xm5fq5uhmwvmj4xdfxf19r.png alt= width=217 height=151 /
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