What happens during normal inspiration?
I.The P_pl decreases further below atmospheric.
II.The transpulmonary pressure gradient widens.
III.P_alv drops below that at the airway opening.

Question

What happens during normal inspiration? I.The P_pl decreases further below atmospheric. II.The transpulmonary pressure gradient widens. III.P_alv drops below that at the airway opening.

Quizplus · Accepted Answer

During normal inspiration, the diaphragm contracts, increasing the volume of the thoracic cavity. This leads to a decrease in intrapulmonary pressure (below atmospheric pressure), causing air to flow into the lungs. The transpulmonary pressure gradient (the difference between the pressure inside the lungs and the pleural pressure) widens, facilitating lung expansion. Additionally, the pressure at the alveoli drops below that at the airway opening, ensuring air flows into the alveoli.

What Happens During Normal Inspiration