hengitysliikkeestä

Hengitysliike refers to the physical act of breathing, involving the coordinated movement of the respiratory muscles to facilitate the exchange of gases in the lungs. This involuntary process is essential for sustaining life, providing the body with the oxygen it needs and removing carbon dioxide, a waste product of metabolism. The primary muscles involved in breathing are the diaphragm and the intercostal muscles.

During inhalation, the diaphragm, a dome-shaped muscle located at the base of the chest cavity, contracts and flattens. Simultaneously, the external intercostal muscles between the ribs contract, lifting the rib cage upwards and outwards. These actions increase the volume of the thoracic cavity, creating negative pressure that draws air into the lungs.

Exhalation is typically a passive process. The diaphragm and external intercostal muscles relax, allowing the chest cavity to return to its resting size. This reduces the volume within the lungs, increasing the pressure and forcing air out. Forceful exhalation can involve the contraction of abdominal muscles and internal intercostal muscles. The rhythmic and controlled nature of the hengitysliike ensures a continuous supply of oxygen to the body's tissues and efficient removal of carbon dioxide. Variations in breathing patterns can occur due to physical activity, emotional state, or certain medical conditions.