11. 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 lor characteristic. (1) Bion.hu Cut end of nb Heart (ii) (iii) Luns A. (i) Trachea: It is supported by bony rings for conducting inspired air. B. (ii) Ribs: When we breathe out, ribs are liſted. C. (iii) Alveoli: Thin-walled sac like structures for exchange of gases. D. (iv) Diaphragm: It is pulled up when we breathe in.
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(iii) Alveoli: Thin-walled sac like structures for exchange of gases.
Explanation:
The alveoli are the spaces between the lungs and the blood where oxygen and carbon dioxide are exchanged while breathing in and out. The alveoli transport oxygen from the air into the circulation, where it goes to all of the body's tissues. Your trachea's principal function is to transfer air into and out of your lungs. Because it is a stiff, flexible tube, it offers a steady path for oxygen to enter your body. The chest cavity increases when the diaphragm flattens and collapses. This contraction creates a vacuum, sucking air into the lungs.
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