Mechanics of Breathing


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Mechanics of Breathing
Mechanics of BreathingFor the normal physiological case of breathing, air flows into the lungs when the alveolar pressure drops below the pressure of the surrounding ambient air. This is known as "negative pressure breathing" because the pressure in the alveoli must be negative with respect to the surrounding air. This negative pressure in the alveoli is caused by muscle contractions that increase the volume of the lung causing the alveoli to expand.Transmural pressure gradient is defined by the difference in pressure between atmospheric air and the air in the alveoli. As the transmural pressure gradient increases, the alveoli expand.Intrapleural press…
Citation
Lee Waite, Ph.D., P.E.; Jerry Fine, Ph.D.: Applied Biofluid Mechanics, Second Edition. Mechanics of Breathing, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export