INSPIRATION

• PROCESS OF INSPIRATION?

  1. External intercostal muscles contract and pull ribs up and outwards
  2. Internal intercostal muscles relax
  3. Diaphragm contracts causing it to move down and flatten
  4. Lung air pressure decreases
  5. Lung volume increases
  6. Air moves into lungs, as atmospheric pressure is greater than thorax pressure
• WHAT HAPPENS TO THE RIBS IN INSPIRATION?

  are pulled up and outwards
• WHAT DO EXTERNAL INTERCOSTAL MUSCLES DO IN INSPIRATION?

  contract
• WHAT HAPPENS TO THE INTERNAL INTERCOSTAL MUSCLES IN INSPIRATION?

  relax
• WHAT HAPPENS TO THE DIAPHRAGM IN INSPIRATION?

  contracts, causing it to move down and flatten
• WHAT HAPPENS TO LUNG AIR PRESSURE IN INSPIRATION?

  decreases
• WHAT HAPPENS TO LUNG VOLUME IN INSPIRATION?

  increases