bröstkorgsrörelser

Bröstkorgsrörelser refers to the movements of the rib cage, which are a fundamental part of respiration. These movements involve the expansion and contraction of the thoracic cavity, facilitating the intake and expulsion of air. The primary muscles involved in these movements are the intercostal muscles located between the ribs and the diaphragm, a large muscle situated at the base of the thoracic cavity.

During inhalation, the external intercostal muscles contract, pulling the ribs upward and outward. Simultaneously, the diaphragm contracts and flattens, increasing the vertical volume of the thoracic cavity. These combined actions enlarge the chest cavity, creating a lower pressure within the lungs than in the surrounding atmosphere, which draws air in.

Exhalation, particularly quiet exhalation, is largely a passive process. The external intercostal muscles relax, and the elastic recoil of the lungs and chest wall causes the rib cage to move downward and inward, decreasing the volume of the thoracic cavity. This compression increases the pressure within the lungs, forcing air out. Forced exhalation involves the contraction of internal intercostal muscles and abdominal muscles to further reduce the chest cavity volume. Bröstkorgsrörelser are crucial for gas exchange and maintaining oxygen levels in the body.