Describe what happens to the rib cage when the intercostal muscles contract.
Question: Describe what happens to the rib cage when the intercostal muscles contract.
When the intercostal muscles contract, they cause the rib cage to expand and move outward, which increases the size of the chest cavity and lung volume. This process is called inspiration or inhalation. The external intercostal muscles are responsible for the expansion of the rib cage, while the internal and innermost intercostal muscles aid in forced expiration. During inspiration, the diaphragm also contracts and moves downwards, which further increases the size of the chest cavity and decreases the air pressure inside it, allowing air to be drawn into the lungs.
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