When the glottis is open and no air is flowing into or out of the lungs, the pressures in all parts of the respiratory tree, all the way to the alveoli, are equal to atmospheric pressure, which is …

Feb 4, 2025 · Pulmonary ventilation is the process of moving air into and out of the lungs to facilitate gas exchange. It is driven by a pressure gradient—the difference between …

Jun 12, 2025 · What causes air trapping in the lungs? The lungs contain more than 300 million tiny, stretchy air sacs known as alveoli. Breathing in and out causes these air sacs to expand …

Inspiration is the process that causes air to enter the lungs, and expiration is the process that causes air to leave the lungs (Figure 22.3.3). A respiratory cycle is one sequence of inspiration …

The process of moving air into and out of your lungs is called ventilation, or breathing. Ventilating the lungs is brought about by the contraction and relaxation of the intercostal muscles and the …

Oct 10, 2025 · Convection, or mass flow, is responsible for movement of air from the environment into the lungs and for movement of blood between the lungs and the tissues. Respiratory …

Sep 7, 2023 · The air inside our lungs moves in and out because of the movement of the diaphragm as well as the ribs and chest cavity.

To breathe in (inhale), you use the muscles of your rib cage – especially the major muscle, the diaphragm. Your diaphragm tightens and flattens, allowing you to suck air into your lungs. To …

When thoracic pressure falls below atmospheric pressure, air moves down the generated pressure gradient and enters the lung. Note that this increase in thoracic volume comes at the …

This chapter describes the mechanisms by which air is moved into and out of the lung, or pulmonary mechanics. Before we get in to the details of how we breathe in, let me make sure …