Which of the following best describes the role of the diaphragm during breathing?

The diaphragm is a dome-shaped muscle located at the base of the thoracic cavity and plays a central role in the process of breathing, specifically during inhalation. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity. This expansion creates a negative pressure gradient compared to the external atmosphere, causing air to be drawn into the lungs. As a result, the contraction of the diaphragm is essential for effective inhalation, making it the primary muscle involved in this phase of the respiratory cycle.

While the diaphragm may provide some stabilization to the torso and support for the abdominal cavity during various movements, its primary and most critical function is to facilitate breathing. Understanding this role is vital for both fitness professionals and individuals seeking to enhance their respiratory efficiency during exercise and daily activities.