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(i) Draw a diagram of human respiratory system and label on it.

(a) larynx                  (b) trachea
(c) lungs                    (d) bronchi

(ii) Why do the walls of the trachea not collapse when there is less air in it?

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(ii) Trachea is supported by the presence of rings of cartilage which hold them in place and ensure that the air passage does not collapse when there is a little air.

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