Biology 20 – Unit D - Patricia Schwandt Courses

A muscle between the abdominal and thoracic cavities. When relaxed, the muscle is in a dome-shaped position and moves upward in the abdominal cavity, causing air to rush out of the lungs due to the increased pressure in the chest. 3. Internal Intercostal. Can contract to increase pressure on the chest and force exhalation with a little more power. ................
................