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Given alongside is a diagrammatic sketch of a part in human lungs

Given alongside is a diagrammatic sketch of a part in human lungs. Name the parts numbered 1-4. What do the arrows 5 and 6 indicate? Respiratory System, Concise Biology Selina Solutions ICSE Class 9.

(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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