Question

When the volume inside the lungs increases, the intrapulmonary pressure.

• A. decreases
• B. increases
• C. equalises

Answer 1

The correct option is A decreases

Pressure and volume are inversely proportional to each other.
When the pressure increases, volume decreases, and vice versa. Therefore, when the volume inside the lungs increases, the pressure decreases. At this point, this pressure is lesser than the atmospheric pressure and causes air to gush into the lungs.