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
• 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 the thoracic cavity and thus helps in inhalation and exhalation.