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Question

The figure given below shows a small part of human lung where exchange of gases takes place. Select the option which represents labelled part (A, B, C or D) correctly identified along with its function.

D : capillary wall - exchange of O2 and CO2 takes place here
B : red blood cells - transport of CO2 mainly.
A : alveolar cavity - main site of exchange of respiratory gases
C : arterial capillary - passes oxygen to tissues

Solution

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