How do ribs contribute to the process of respiration?

Ribs play a crucial role in the process of respiration primarily by allowing for the expansion of the thoracic cavity. When we inhale, the diaphragm contracts and moves downward, which creates a vacuum effect in the thoracic cavity. Simultaneously, the intercostal muscles, which are located between the ribs, contract and lift the ribcage upward and outward. This action increases the volume of the thoracic cavity and decreases the pressure inside it, enabling air to flow into the lungs.

The flexibility and mobility of the ribs facilitate this expansion, making it possible for the lungs to efficiently fill with air. As the ribcage expands, the lungs are also able to expand and accommodate the incoming air, allowing for effective gas exchange in the alveoli. Therefore, the contribution of ribs to the expansion of the thoracic cavity is essential for proper breathing mechanics and overall respiratory function.