Inhalation and exhalation in lungs

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  • Created by: Steff06
  • Created on: 11-04-16 11:24
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  • Inhaling and exhaling (lungs):
    • INHALING:
      • 1. Diaphragm CONTRACTS to become flatter and pushes digestive organs down.
      • 2. External INTERCOSTAL MUSCLES CONTRACT to raise ribs.
      • 3. VOLUME of chest cavity INCREASES.
      • 4. PRESSURE in chest cavity DROPS atmospheric pressure.
      • 5. Air moves INTO LUNGS.
    • EXHALING:
      • 1. Diaphragm RELAXES and is pushed up by displaced organs underneath.
      • 2. External INTERCOSTAL MUSCLES RELAX and ribs fall.
      • 3. VOLUME of chest cavity DECREASES
      • 4. PRESSURE in lungs INCREASES and rises above atmospheric pressure.
      • 5. Air moves OUT OF LUNGS.

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