This generates a pressure gradient between the proximal airways (nose and mouth) and the lung parenchyma, resulting in a flow of air from the external environment into the alveoli through the airways generating the inspiratory flow. This is represented by the alveolar pressure in blue, with the values dipping slightly below what is considered the zero reference value of atmospheric pressure. According to Boyle's law, to expand the volume of the chest cavity the Pmus reduce the pressure of alveolar gas. ![]() In this figure, inspiratory muscle effort, represented by Pmus, varies in intensity and duration in each cycle. When the respiratory muscles relax, alveolar pressure increases, and expiratory flow begins passively due to lung elastic recoil pressure.Ī- Normal effort, B-Intense effort, and C-Weak effort. Tidal volume is the result of flow x time. Therefore, it generates inspiratory flow. Variations of the respiratory muscle effort (Pmus) influence the alveolar pressure making it negative during inspiration.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |