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NEET · Biology · STD 11 - 14. Breathing and exchange in gases
The figure shows a diagrammatic view of human respiratory system with labels \(A, B, C\) and \(D\). Select the option which gives correct identification and main function and / or characteristic.
- A \(C\) - Alveoli - Thin walled vascular bag like structures for exchange of gases.
- B \(D\) - Lower end of lungs - Diaphragm pulls it down during inspiration.
- C \(A\) - Trachea - Long tube supported by complete cartilaginous rings for conducting inspired air.
- D \(B\) - Pleural membrane - Surround ribs on both sides to provide cushion against rubbing.
Answer & Solution
Correct Answer
(A) \(C\) - Alveoli - Thin walled vascular bag like structures for exchange of gases.
Step-by-step Solution
Detailed explanation
(a) : In the given figure \(A\) is trachea. It is supported by incomplete cartilaginous rings which prevent its collapse during inspiration. \(B\) is pleural membrane. It encloses lungs. \(C\) are alveoli. They are thin walled sacs having extensive network of capillaries for gaseous exchange. \(D\) is diaphragm.
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