What occurs to the diaphragm during the act of inspiration?

During the act of inspiration, the diaphragm contracts and moves down, expanding the thoracic cavity. This downward movement lowers the pressure in the chest cavity, allowing air to flow into the lungs as the body seeks to equalize the pressure between the outside atmosphere and the internal pleural space. The contraction of the diaphragm is essential for inhalation because it creates a vacuum effect that draws air into the lungs, facilitating oxygen exchange. This process is vital for respiratory function and overall oxygenation of the body.

The diaphragm's role in inspiration is fundamental, making it an active participant in the respiratory cycle rather than remaining inactive or relaxing. Its contraction is a key step that supports effective breathing.