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Process of breathing


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Process of breathing

  1. 1. Process of Breathing 7SCIENCE Mon, Nov. 22, 2010
  2. 2. Review • What are the main organs of the respiratory system? – Nasal cavity – Pharynx – Larynx – Trachea – Bronchi – Lungs • We will focus on the processes in and around the lungs
  3. 3. Review of how air moves in your body • Air enters the nose or mouth and travels down the: – pharynx, larynx, trachea and down the bronchi • The bronchi branch to form bronchioles • At the end of bronchioles are the alveoli (air sacs) where gas exchange occurs – What gases are exchanged here? – Oxygen and carbon dioxide!
  4. 4. Process of Breathing • Diaphragm is a muscle under your lungs and helps move air in and out of the body • Breathe in = the diaphragm contracts and moves down to allow air to move into lungs • Breathe out = opposite – Diaphragm relaxes to return to the normal shape – Gases are pushed out
  5. 5. Health problems related to breathing • Bronchitis – Bronchial tubes are irritated and too much mucus is produced – Can’t move waste out of lungs • Emphysema – Alveoli cannot expand and contract – Mostly related to smoking • Asthma – Reaction that causes a person to have trouble breathing, cough – Treated by inhaling drugs