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.