well, first of all the left lung at a certain point in history compresses until its hard to breath and the right lung at this point expands. This is unatural.
Intrapulmonary pressure is the pressure inside the lung alveoli, while intrapleural pressure is the pressure in the pleural cavity. During normal breathing, intrapleural pressure is lower than intrapulmonary pressure, creating a pressure gradient that helps keep the lungs inflated.
Intrathoracic pressure
Intrathoracic pressure is the pressure inside of the pleural cavity. It is also called intrapleural pressure and the normal pressure is called negative pressure.
Intrapleural pressure is most negative at the completion of inspiration.
Intrathoracic pressure, intrapleural pressure, and transmural pulmonary vascular pressure exhibit rhythmic variations with respiration. These variations are important for normal breathing mechanics and gas exchange in the lungs.
intrapleural pressure
Intrapleural pressure is maintained by the opposing forces of the elastic recoil of the lung and chest wall. During inspiration, the diaphragm contracts and the intercostal muscles expand the thoracic cage, causing a decrease in intrapleural pressure. This negative pressure helps keep the lungs inflated.
Intrapleural pressure becomes positive during forced expiration or coughing when the muscles contract forcefully to increase the pressure within the thoracic cavity. This positive intrapleural pressure helps to push air out of the lungs.
Because the negative pressure is the major factor preventing the lungs from collapsing. If the intrapleural pressure became equal to atmospheric pressure the lungs would recoil and collapse.
The lung will collapse (atelectasis) because the negative intrapleural pressure gradient that keeps the lung inflated has is now at equilibrium with atmospheric pressure.
During quiet breathing, the intrapleural pressure decreases during inspiration as the diaphragm contracts and the thoracic cavity expands, leading to a decrease in pressure inside the lungs. During expiration, intrapleural pressure increases as the diaphragm relaxes and the thoracic cavity decreases in volume, causing an increase in pressure inside the lungs.
true.