When you exhale the rib cage rises and the diaphragm contacts?

When you exhale, the diaphragm actually relaxes and moves upward into the thoracic cavity, while the rib cage decreases in volume as the intercostal muscles relax. This increase in pressure within the lungs pushes air out of the respiratory system. The rib cage may rise slightly during inhalation, but during exhalation, it generally falls as the body expels air. Thus, the rib cage does not rise during exhalation; rather, it contracts.