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 (P_alv) will A) decrease below atmospheric pressure (P_B), causing air to move out of his lungs. B) become greater than atmospheric pressure (P_B), causing air to move into his lungs. C) decrease below atmospheric pressure (P_B), causing air to move into his lungs. D) become greater than atmospheric pressure (P_B), causing air to move out of his lungs. E) does not change.

Question

Quizplus · Accepted Answer

During inspiration, the diaphragm contracts, increasing the volume of the thoracic cavity and decreasing the pressure in the alveoli below atmospheric pressure, which causes air to move into the lungs.

During Inspiration, Contraction of the Diaphragm Causes the Volume of Mr