Question

multiple choice question
in which situation would air flow into the lungs?
o when intra - alveolar pressure is greater than atmospheric pressure
o when intra - alveolar pressure is less than atmospheric pressure

Explanation:

Air flows from an area of higher pressure to an area of lower pressure. For air to flow INTO the lungs (inspiration), the pressure inside the alveoli (intra - alveolar pressure) must be lower than the atmospheric pressure. This creates a pressure gradient that drives air into the lungs.

Answer:

when intra - alveolar pressure is less than atmospheric pressure