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1.2.3 Lesson 1 - The respiratory system

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1.2.3 Lesson 1 - The respiratory system

  1. 1. GCSE PEUnit 1.2.3 The respiratory system
  2. 2. Start as we mean to go on.....Can you name the 4 factors that may have an effect on the cardiovascular system and increase the risk of heart disease? 1. High Cholesterol 2. Recreational drugs 3. Sedentary lifestyle 4. Stress
  3. 3. Today’s learning objectives:By the end of this lesson you should be able to:  Explain and understand how the respiratory system works Understand tidal volume Understand vital capacity
  4. 4. Starter task…• Get into groups of 3/4.• Using the envelopes provided you need to use your own knowledge to put the statements in to the correct order.• Make sure you read each statement thoroughly and put it into a logical sequence.• Once you have finished make sure you check that it is right.
  5. 5. So did you get it in the right order?• When breathing in,• (inhaling)• the intercostal muscles• (the muscles between the ribs)• contract and lift the chest upwards and outwards• while the diaphragm tightens and lowers.• (a sheet of muscle which separates the chest region from the rest of the body cavity)• These actions open the lungs and create a vacuum inside so that air (with oxygen) can• rush in through the nose and mouth, where it is warmed, moistened and filtered.
  6. 6. So did you get it in the right order?• The air passes through the Trachea• (the tube that takes air into the chest)• and into one of the two bronchi into the left or right lung.• After passing through the many bronchioles (smaller tubes) it arrives into• some of the millions of tiny sacs called alveoli which are surrounded by• capillaries (very narrow tubes) that carry blood.
  7. 7. So did you get it in the right order?• Here oxygen, in the alveoli, passes into the blood so it• can be transported around the body.• At the same time waste rich blood releases it’s• carbon dioxide into the alveoli.• It takes the opposite journey out of the body;• exhaled air contains and increased amount of carbon dioxide.• The whole process is called• gaseous exchange.
  8. 8. The respiratory system
  9. 9. The respiratory system… Respiratory System
  10. 10. So what do we breath in? Argon Oxygen Using the table on page ???, Task ???, you need toto write down what % of each gas is in the air that we breathe in. Nitrogen Follow this by putting the % for each gas that we breathe out. Other Carbon gases Dioxide
  11. 11. So what do we breath in? Argon Oxygen 0.93% 20% Stays the same! 16% Stays the same! Nitrogen 4% 79% Carbon Other Dioxide 0.04% Stays the 0.03% same!
  12. 12. Tidal Volume‘is the amount of air inspired and expired witheach normal breath at rest or during exercise’ How do we measure it? Practical – lets see how we measure it using a Spirometer Task 2
  13. 13. Vital Capacity ‘is the greatest amount of air that can bemade to pass into and out of the lungs by the most forceful inspiration and expiration’ How do we measure it? Practical – lets see how we measure it using a Peak Flow meter Task 2
  14. 14. Today’s learning objectives:By the end of this lesson you should be able to:  Explain and understand how the respiratory system works Understand tidal volume Understand vital capacity
  15. 15. HomeworkComplete the following:• Any missing notes from the lesson.• Hwk 1 Page 2• Hwk 2 Page 3

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