What is the primary role of the diaphragm in breathing?

The primary role of the diaphragm in breathing is to expand and contract the thoracic cavity. When the diaphragm contracts, it descends and creates a negative pressure within the thoracic cavity, allowing air to rush into the lungs. This process is essential for inhalation. Conversely, when the diaphragm relaxes, it moves upward, reducing the volume of the thoracic cavity and pushing air out of the lungs during exhalation. This fundamental action of the diaphragm is vital for efficient respiratory function and is a key mechanism for the process of breathing.

Understanding this function of the diaphragm is crucial for first responders as it underlines the importance of maintaining an open airway and recognizing any potential respiratory distress that could affect breathing mechanics.