What abdominal muscle contracts to help pull air into the lungs during inspiration?

During inspiration, the diaphragm is the primary muscle that contracts to facilitate the intake of air into the lungs. As the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity. This creates a negative pressure within the lungs relative to the outside atmosphere, allowing air to flow in.

The diaphragm is a dome-shaped muscle located at the base of the thoracic cavity and is essential for the breathing process. Its relaxation allows for expiration, while its contraction is critical for inhalation, making it a key player in respiratory mechanics. Understanding this function is vital for grasping how the respiratory system operates during normal breathing.