During bellows breath, you also work the muscles used during exhalation—the abdominals and the internal intercostals—by forcefully contracting your midsection as you breathe out. During exhale ...

followed by an explanation of the process of inhalation and exhalation. He describes the role of the diaphragm and intercostal muscles in creating a difference in pressure in the chest which ...

This process involves movements of the ribs, intercostal muscles and diaphragm to move air into and out of the lungs. These are the changes involved during inhalation and exhalation. Alveoli have ...