What is the primary function(s) of the alveoli?

What is the primary function(s) of the alveoli? Correct Answer All of the mentioned

The thin walls of the alveoli contain capillaries which aid in transfer of oxygen and toxic substances into the blood and removal of carbon dioxide.

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Abstract class A has 4 virtual functions. Abstract class B defines only 2 of those member functions as it extends class A. Class C extends class B and implements the other two member functions of class A. Choose the correct option below.
Surfactant of lung alveoli
Types of cells found in the alveoli are