Question

What is the mechanism which causes air to enter a person’s lung when inhaling?:

The decrease in lung volume.
The chemical difference between oxygen and carbon dioxide .
The force of the person drawing in air by breathing.
The difference in atmospheric pressure in the lungs.

Answer 1

I believe it;s the difference in pressure

Step-by-step explanation:

This is caused by the diaphragm contracting and therefore expanding the thoracic cavity. This increase in volume causes a decrease in pressure.