Which of the following best describes the primary role of the diaphragm?

The primary role of the diaphragm is to assist in the process of breathing. The diaphragm is a dome-shaped muscle located at the base of the thoracic cavity, and it plays a critical role in respiration. When the diaphragm contracts, it flattens and moves downward, creating a vacuum effect that allows air to be pulled into the lungs. This action increases the volume of the thoracic cavity, lowering the pressure inside the lungs relative to the atmospheric pressure, which facilitates inhalation.

During exhalation, the diaphragm relaxes and returns to its dome shape, which helps push air out of the lungs. This cyclical contraction and relaxation are vital for efficient gas exchange in the body, as oxygen is taken in and carbon dioxide is expelled. Understanding the role of the diaphragm is essential for recognizing how the respiratory system works and the importance of maintaining proper lung function.