What is the primary role of the diaphragm during breathing?

The primary role of the diaphragm during breathing is to increase the volume of the thorax. When the diaphragm contracts, it moves downward, which expands the thoracic cavity. This increase in volume creates a negative pressure within the thoracic cavity, causing air to be drawn into the lungs. This process is essential for inhalation, as it allows the lungs to fill with air efficiently.

Furthermore, understanding the mechanics of breathing is crucial for grasping how respiratory efficiency is generated. The diaphragm's contraction and the resulting increase in thoracic volume directly facilitate the exchange of oxygen and carbon dioxide in the lungs, which is fundamental to respiratory function and overall bodily health.