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F:\Compaq 2010\P&P Form 3 10\1 Respiration\Slaid\2 Breathing Mechanism 2

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Modul P&P Sains tingkatan 3

Modul P&P Sains tingkatan 3

Published in: Health & Medicine

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  • 1. BREATHING
    • The process that involves the exchange of gases between an organism and the external environment.
    • There are two processes involved:-
      • Inhalation (breathing in – the taking in of air )
      • Exhalation (breathing out – the giving out of air)
  • 2.
    • The sequence of air flow is;
    • Nose Trachea Bronchus
    • Alveolus Bronchioles
  • 3. INHALATION AND EXHALATION
    • Inhalation is the process which enables air from the atmosphere to be drawn into the lungs.
    • Exhalation is the process which enables air to be expelled from the lungs to the atmosphere.
    • These two processes are caused by the action of the diaphragm and the intercostal muscles which cause the change in the air pressure in the thoracic cavity.
  • 4. INHALATION
    • During inhalation, the diaphragm contracts and flattens and the external intercostal muscles contract which causes the ribs to move upward and forward
    • The above actions increases the volume of the thoracic cavity.
    • The increase in the volume causes the air pressure in the lung decreases and is lower than the external atmospheric pressure
    • So, air from the atmosphere is forced into the lungs.
  • 5. INHALATION Diaphragm contracts and flattens The ribs move upward and forward
  • 6. INHALATION
  • 7. BUILDING A MODEL TO STUDY THE ACTION OF THE DIAPHRAGM IN BREATHING MECHANISM
    • When the rubber membrane
    • is pulled downwards, the
    • volume of air in the glass jar
    • increases and the air
    • pressure in the glass jar
    • reduces
    • As a result, the balloons
    • inflate and become bigger
  • 8. EXHALATION
    • During exhalation, the diaphragm relaxes and curves upwards to form dome-shaped.
    • The internal intercostal muscles contract which causes the ribs to return to its original position
    • The above actions reduces the volume of the thoracic cavity.
    • Air pressure in the thoracic cavity increases and exceeds external atmospheric pressure
    • So, air from the atmosphere is forced out from the lungs.
  • 9. EXHALATION The ribs return to its original position Diaphragm relaxes and curves upwards to form dome-shaped.
  • 10. EXHALATION
  • 11. BUILDING A MODEL TO STUDY THE ACTION OF THE DIAPHRAGM IN BREATHING MECHANISM
    • When the rubber membrane
    • is pushed upwards, the
    • volume of air in the glass jar
    • decreases and the air
    • pressure in the glass jar
    • increases
    • As a result, the balloons
    • deflate and become smaller
  • 12.  
  • 13. SIMILARITY BETWEEN INHALATION AND EXHALATION
    • Both processes involve the diaphragm and intercostal muscles
  • 14. DIFFERENCES BETWEEN INHALATION AND EXHALATION Air is exhaled from the thoracic cavity Flow of air Air is drawn into the thoracic cavity Increases Air pressure in thoracic cavity Decreases Decreases Volume of thoracic cavity Increases Internal- contracts External- relax Action of intercostal muscles Internal- relax External- contracts Relaxes Action of diaphragm Contracts (flattens) EXHALATION INHALATION