Respiratory movement of the lungs

During inhalation, the external intercostal muscles contract, the ribs lift up, the front, back, left and right diameters of the thorax increase, the diaphragm contracts, the top of the diaphragm descends, the upper and lower diameters of the thorax increase, the lungs expand, and external air enters the lungs. Complete the inhalation. Just the opposite when exhaling, the external intercostal muscles relax, the ribs descend, the front, back, left and right diameters of the thorax decrease, the diaphragm relaxes, the top of the diaphragm rises, the upper and lower diameters of the thorax decrease, the lungs retract, and the gas in the lungs is discharged. Complete Exhale.