Exhalation

• What happens to the intercostal muscles during Exhalation?

  The External intercostal muscles relax
• What happens to the ribcage?

  The ribcage moves down and in
• What happens to the diaphram?

  The Diaphram relaxes and moves up becoming dome shaped
• How does this affect the volume inside the Thorax?

  The volume inside the Thorax decreases
• How does this affect the pressure inside the Thorax?

  The Pressure inside the Thorax increases
• What happens to the air?

  Air is forced out down the pressure gradient
• Exhalation .