Given below is a table relating to some aspects of digestion. The numbers 1 to 4 indicate:rom the options given below choose the option which is NOT a function of the ‘C’ shaped cartilage rings in the trachea of the human respiratory system is: a) They provide flexibility to the trachea. b) They keep the trachea distended permanently. c) They ensure that air passage does not collapse. d) They are the sites of exchange of gases.
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Explanation:
option d
the alveoli are the structure which are responsible for exchange of gases
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