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The figure given below shows a small part of human lung where exchange of gases takes place. Which part is correctly identified?
image

  1. A
    B : Red blood cell - transport of mainly
  2. B
    C : Arterial capillary - passes oxygen to tissues
  3. C
    A : alveolar cavity - main site of exchange of respiratory gases
  4. D
    D : Capillary wall - exchange of and takes place here

Solution & Step-by-step Explanation

In the diagram of the respiratory membrane, Part A represents the alveolar cavity. This is the primary site for the diffusion of gases ( into blood, into the alveolus).RBCs (B) transport mainly.The "capillary wall" (D) is actually the endothelium of the alveolar capillary.

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The figure given below shows a small part of human lung where exchange of gases takes place. Which part is correctly identified?
image
A
B : Red blood cell - transport of mainly
B
C : Arterial capillary - passes oxygen to tissues
C
A : alveolar cavity - main site of exchange of respiratory gases
D
D : Capillary wall - exchange of and takes place here

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Breathing and ExchangeAlveoli

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