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