![]() This initiates a sequence of phenomena, including a decrease in P pl, distention of lung’s resilient elements, decline in intraalveolar pressure, air inflow to pulmonary alveoli and increase in lung volumes ( Light, 2007 Culver, 2008 Troyer and Wilson, 2016). Therefore, the inspiratory contraction of the diaphragm and the external intercostal muscles pull the parietal pleura outward, enlarging the volume of thoracic cavity. Since, under normal conditions, the parietal pleura tightly adheres to the internal surface of the thoracic wall and diaphragm, it strictly follows the movement of these anatomical structures. ![]() ![]() This pressure is important not only for maintaining normal lung function but also for proper functioning of the cardiovascular system. Hence, the opposing recoils of the lungs and chest wall create a negative (subatmospheric) P pl ( Culver, 2008 Feller-Kopman and Light, 2018). This is in contrast to the lungs which, under normal volumes, display strong inward elastic recoil. ![]() As unstressed volume of the chest cavity is relatively high, chest walls show a tendency to recoil outward, i.e., a constant tendency to expand. Grabczak, Rafal Krenke, in Encyclopedia of Respiratory Medicine(Second Edition), 2022 Physiology of Pleural PressureĪ normal pleural pressure (P pl ) results from counteracting elastic recoil forces of the lung and the chest wall. ![]()
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