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.
A. (i)Trachea:Itissupportedbybonyringsforconductinginspiredair. B. (ii)Ribs:Whenwebreatheout,ribsarelifted.
C. (iii)Alveoli:Thick-walledsaclikestructuresforexchangeofgases. D. (iv)Diaphragm:Itispulledupwhenwebreatheout.
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a is correct answer for this
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