Biology
Given alongside is a diagrammatic sketch of a part in human lungs
(i) Name the parts numbered 1-4
(ii) What do the arrows 5 and 6 indicate?
Respiratory System
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Answer
(i) The parts numbered 1-4 are:
- 1 → Thin walls of capillary
- 2 → Red blood corpuscles
- 3 → Plasma
- 4 → Thin wall of alveoli
(ii) Arrows at 5 & 6 indicate diffusion of carbon dioxide outside and diffusion of oxygen inside respectively.
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