Why does the lung collapse if intrapleural pressure is not maintain?

If intrapleural pressure is not maintained, the lung will collapse due to the elastic recoil of the lung tissue. The lung is a highly elastic organ, and when it is not inflated, it will recoil and collapse inward. This is because the lung tissue is made up of a network of elastin fibers, which are elastic fibers that stretch and recoil when the lung is inflated and deflated. When the intrapleural pressure is negative, it helps to keep the lung inflated by pulling the lung tissue outward. However, if the intrapleural pressure is not negative, the lung tissue will recoil and the lung will collapse.

The intrapleural pressure is created by the difference in pressure between the inside of the lung (the intra-alveolar pressure) and the outside of the lung (the intrapleural pressure). The intra-alveolar pressure is positive, while the intrapleural pressure is negative. This difference in pressure creates a force that pulls the lung tissue outward and helps to keep the lung inflated.

If the intrapleural pressure is not maintained, the lung will collapse because the elastic recoil of the lung tissue will be greater than the force pulling the lung tissue outward. This will cause the lung to collapse inward and the person will be unable to breathe.