Carefully study the diagram of the human respiratory system with labels (i), (ii), (iii) and (iv). Select the option which gives correct identification and main function and /or characteristic.

Q.) Carefully study the diagram of the human
respiratory system with labels (i), (ii), (iii)
and (iv). Select the option which gives
correct identification and main function
and /or characteristic.

Carefully study the diagram of the human respiratory system with labels (i), (ii), (iii) and (iv). 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 struc￾tures for exchange of gases.

(d) (iv) Diaphragm: It is pulled up when we breathe in.

Ans. (c) (iii) Aveoli: Thin-walled sac like structures for exchange of gases.

Explanation: Trachea is supported by rings of cartilages to prevent it from collapsing when there is not air present in it. When we breathe out, the muscles of dia￾phragm and ribs relax and the diaphragm and muscles attached to ribs contract when we breathe in.

Leave a Reply