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Question
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.
Options
(i) Trachea: It is supported by bony rings for conducting inspired air.
(ii) Ribs: When we breathe out, ribs are lifted.
(iii) Alveoli: Thin-walled sac like structures for exchange of gases.
(iv) Diaphragm: It is pulled up when we breathe in.
MCQ
Solution
(iii) Alveoli: Thin-walled sac like structures for exchange of gases.
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