What does the diaphragm primarily assist with?

The diaphragm is a crucial muscle located at the base of the chest cavity, and its primary role is to facilitate breathing and ventilation of the lungs. When the diaphragm contracts, it moves downward, creating a negative pressure in the thoracic cavity. This process allows air to flow into the lungs, making inhalation possible. When the diaphragm relaxes, it moves back to its original position, which helps push air out of the lungs during exhalation. Thus, the diaphragm's contractions and relaxations are integral to the mechanics of respiratory function, regulating the inhalation and exhalation process and contributing to effective ventilation.