Question

during inspiration, contraction of the diaphragm causes the volume of mr. jones thoracic cavity to increase and the pleural pressure to decrease. the pressure in his alveoli (palv) will
multiple choice
decrease below atmospheric pressure (pg), causing air to move into his lungs.
become greater than atmospheric pressure (pg), causing air to move out of his lungs.
does not change.
become greater than atmospheric pressure (pg), causing air to move into his lungs.
decrease below atmospheric pressure (pg), causing air to move out of his lungs.

Explanation:

During inspiration, the diaphragm contracts, increasing the thoracic - cavity volume and decreasing pleural pressure. This leads to a decrease in alveolar pressure below atmospheric pressure, creating a pressure gradient that causes air to move into the lungs.

Answer:

decrease below atmospheric pressure (Pg), causing air to move into his lungs.