What role do intercostal muscles play?

Intercostal muscles are situated between the ribs and play a crucial role in the mechanics of breathing. When these muscles contract, they help expand the thoracic cavity, which reduces pressure in the chest and allows air to be drawn into the lungs during inhalation. Conversely, when they relax, they assist in expelling air from the lungs during exhalation by aiding in the return of the rib cage to its original position. This rhythmic contraction and relaxation are vital for effective ventilation. The importance of intercostal muscles in respiration highlights their functional significance within the respiratory system, making this the most accurate description of their role.