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The structure and function of the respiratory system


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The structure and function of the respiratory system

  1. 1. P6 D escribe the structure and function of the Respiratory System <ul><li>You need… </li></ul><ul><li>A labelled diagram </li></ul><ul><li>2. A description of each of the components. </li></ul><ul><li>3. Describe the mechanics of breathing (inspiration and expiration) </li></ul><ul><li>4. Describe gaseous exchange in the alveoli. Use a diagram. </li></ul>
  2. 2. Trachea (wind pipe) Bronchus Bronchioles Alveoli Lung Intercostal muscles Ribs Diaphragm The Respiratory System A labelled diagram
  3. 3. Inspiration (breathing in) <ul><li>When we breathe in (inspiration): </li></ul><ul><li>oxygen moves through the nose and mouth </li></ul><ul><li>the inter-costal muscles move the rib cage up and out </li></ul><ul><li>the diaphragm contracts and flattens to give more room for the lungs to fill with oxygen. </li></ul>
  4. 4. Inspiration (breathing in) <ul><li>When we breathe in, oxygen moves through the: </li></ul>Alveoli are little air sacs where the exchange of gases occurs Trachea To the bronchi, that splits into the left and right lungs Bronchioles are smaller branches that can be found at the end of the bronchi
  5. 5. Expiration (breathing out) <ul><li>When we breathe out: </li></ul><ul><li>the rib cage relaxes as the inter-costal muscles relax </li></ul><ul><li>the lungs deflate </li></ul><ul><li>the diaphragm relaxes and becomes larger in its shape. </li></ul>
  6. 6. <ul><li>When we breathe out , carbon dioxide moves from the: </li></ul>Alveoli To the bronchioles and then towards the trachea through the bronchi As we breathe out the carbon dioxide is expelled through the mouth and nose
  7. 7. Gaseous Exchange <ul><li>Gaseous exchange is the exchange of oxygen and carbon dioxide over the breathing surface. </li></ul>alveoli oxygen (O 2 ) terminal air ducts carbon dioxide (CO 2 ) capillary