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Question

What are the functions of the labeled parts 1 and 2 in the diagram?


A

1- Filtering of air, 2- maintaining shape of lungs

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B

1- Exchange of gases, 2- assists in inhalation and exhalation

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C

1- Absorption of gases, 2- assists in cellular respiration

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D

1- Storing gases, 2- exchange of gases

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Solution

The correct option is B

1- Exchange of gases, 2- assists in inhalation and exhalation


1- Alveoli or air sacs which are at the end of bronchioles help in gaseous exchange, namely oxygen and carbon dioxide gases.

2- Diaphragm is a muscular structure at the base of lungs. It increases or decreases the volume of the thoracic cavity and thus helps in inhalation and exhalation.


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