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Q.

Observe the given picture showing human respiratory system and identify the answer with correctly labelled part and description.

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a

D - Diaphragm - Contraction causes expiration

b

A - Epiglottis - Prevents entry of food into trachea

c

B - Trachea - Supported by complete cartilaginous rings

d

C - Alveoli - Sites for pulmonary gas exchange

answer is B.

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Detailed Solution

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Alveoli are sites for gaseous exchange in lungs. 

A - Larynx - Sound box

B - Trachea - Supported by incomplete cartilaginous rings

D - Diaphragm - Contraction causes inspiration

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