The Respiratory System

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The Respiratory System

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1. Respiratory System GCSE PE The Respiratory System Lesson 1

2. Respiratory System GCSE PE Lesson Objectives By the end of this lesson you should be able to….. identify the positions of the larynx, trachea, bronchioles and alveoli and.. explain the function of the respiratory system.

3. Respiratory System GCSE PE Structure of the Lungs The larynx is located between the throat trachea. Its jobs are to keep the airway open, stop food entering the airway and to make sounds. The trachea is located between the larynx and the bronchi its job is to keep the airway open The bronchi are the tubes that enter into the lungs Alveoli would cover 55m2 if they were flattened out. The linings of the alveoli are very thin and only work well when they are moist and clean. A healthy person has a very efficient mechanism for ensuring this. When air is breathed in through the nose, it is: Filtered by the hairs at the entrance to the nose and by mucus which is a sticky substance. Warmed by blood vessels passing to the lining of the nose. Moistened by water vapour.The larynx is located between the throat trachea. Its jobs are to keep the airway open, stop food entering the airway and to make sounds. The trachea is located between the larynx and the bronchi its job is to keep the airway open The bronchi are the tubes that enter into the lungs Alveoli would cover 55m2 if they were flattened out. The linings of the alveoli are very thin and only work well when they are moist and clean. A healthy person has a very efficient mechanism for ensuring this. When air is breathed in through the nose, it is: Filtered by the hairs at the entrance to the nose and by mucus which is a sticky substance. Warmed by blood vessels passing to the lining of the nose. Moistened by water vapour.

4. Respiratory System GCSE PE Question During exercise why is it better to breath in through our nose rather than our mouths???? When air is breathed in through the nose, it is: Filtered by the hairs at the entrance to the nose and by mucus which is a sticky substance. Warmed by blood vessels passing to the lining of the nose. Moistened by water vapour.

5. Respiratory System GCSE PE The Air You Breathe ends up in the Alveoli Air passes through the nose or mouth and then on to the larynx. It carries on through the trachea. The trachea splits into tubes called bronchi (each one is a bronchus) – one each going to the lungs. The bronchi split into progressively smaller tubes called bronchioles. The bronchioles finally end at small bags called alveoli (each one is an alveolus) where the gas exchange takes place.

6. Respiratory System GCSE PE What happens when the air reaches the alveoli??? The alveoli are surrounded by millions of capillaries (very narrow tubes which carry blood). 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 its carbon dioxide into the alveoli.

7. Respiratory System GCSE PE WHY? The air then takes the opposite journey out of the body. Exhaled air contains an increased amount of carbon dioxide. The whole process is called gaseous exchange.

8. Respiratory System GCSE PE The respiratory system has two main functions To bring oxygen into the body. To take carbon dioxide out of the body.

9. Respiratory System GCSE PE Task

10. Respiratory System GCSE PE Task 2 Explain three major functions of nasal passages

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