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Settler

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  1. Settler Pass it on First person – Start off the mechanism of inhalation, turn to the person on your right – next stage, continue (include exhalation)

  2. Module 2Exchange and transport 7.2 Lungs

  3. What do you know?? - Structure of the lungs

  4. Success Criteria Learning Objectives Describe the distribution of cartilage, ciliated epithelium, goblet cells and smooth muscle and elastic fibres in the trachea, bronchi and bronchioles and alveoli of the mammalian gaseous exchange system Describe the functions of cartilage, goblet cells, smooth muscle and elastic fibres Identify tissues in the lungs (Grade E - D) Describe the distribution of tissues in the lungs (Grade C –B) Explain the functions of tissues in the lungs (Grade B – A)

  5. Trachea The trachea is a flexible airway supported by C- rings of cartilage which prevent the trachea collapsing when the air pressure inside falls. Inner lining is a ciliated epithelium and goblet cells. • The goblet cells produce mucus which traps dirt and bacteria. • The cilia move the mucus up to the throat where it is swallowed.

  6. Bronchi– Similar in structure to trachea only narrower. 2 divisions of the trachea. Larger bronchi are supported by cartilage. Bronchioles – branching subdivisions of the bronchi. Larger bronchioles may have cartilage, walls are made mainly of smooth muscle and elastic fibres. The muscle enables them to control the flow of air in and out of the alveoli.

  7. Gas exchange in the alveoli

  8. Task • Design a table to include distribution and function of cartilage, ciliated epithelium, goblet cells, smooth muscle and elastic fibres in the trachea, bronchi, bronchioles and alveoli You may include diagrams if you wish

  9. Tasks • HSW 1)Attacking asthma 2)The first breath

  10. Structures of the human lung

  11. Plenary • Complete match up for cut and stick • Homework – Complete exam questions • Explain the functions of tissues in the lungs (Grade B – A)