Quiet Inspiration

• Quiet Inspiration:

  • Respiratory muscles (diaphragm and external intercostals) contract
  • Increase in thoracic and lung volume
  • Decrease in intrapulmonary pressure
  • Air flows into the lungs down the pressure gradient
  • Airflow stops when intrapulmonary pressure is equal to atmospheric pressure
• Inspiration:

  • volume increases
  • intrapulmonary pressure decreases
  • gas flows in
  • gas flow stops once intrapulmonary pressure is the same as atmospheric pressure