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Select the option which gives correct fu...

Select the option which gives correct function and /or characteristic: of the four parts of human respiratory system.

A

Alveoli: Thin-walled sac like structures for exchange of gases.

B

Diaphragm: It is pulled up when we breathe in.

C

Trachea: It is supported by bony rings for conducting inspired air.

D

Ribs: When we breathe out, ribs are lifted.

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