1.

Carefully study the diagram of the human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and /or characteristic.A. (i) Trachea: It is supported by bony rings for conducting inspired air. B. (ii) Ribs: When we breathe out, ribs are lifted. C. (iii) Alveoli: Thin-walled sac like structures for exchange of gases. D. (iv) Diaphragm: It is pulled up when we breathe in.

Answer»

Correct option is C. (iii) Alveoli: Thin-walled sac like structures for exchange of gases.



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