Question

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

• A. 1 - filtering of air, 2 - maintaining shape of lungs
• B. 1 - exchange of gases, 2 - assists in inhalation and exhalation
• C. 1 - absorption of gases, 2 - assists in cellular respiration
• D. 1 - storing gases, 2 - exchange of gases

Answer 1

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 thoracic cavity and thus helps in inhalation and exhalation.