1. Learning Objectives: 1.To be able to describe the structure of the lungs 2.To explain how the lungs clean themselves 3.To be able to explain gaseous exchange Starter Questions 1.What gas do we breathe in? 2.What gas do we breathe out? 3.What protects our lungs?

2. TASK: Design a leaflet to inform people how they can damage their lungs - e.g. Smoking Working in dusty environments etc Include: What is damaging them The effects it has on the lungs What the consequences may be as a result of these

3. Lungs are the organs of respiration. The process of oxygen and carbon dioxide moving between the lungs and the blood.

4. Trachea Lung Diaphragm Ribs Alveoli Intercostal Muscles Bronchi Bronchioles

6. Draw and label the diagram of the lung in your book!

7. This means that the rib cage must also be able to change position. OBSERVATION Take your hands and place them flat on your chest just above your hips on each side of your body. Now breathe in and out very deeply. Whilst you do this, watch to see what happens to your hands. You should notice the following things….. What do you notice?

8. up outwards When you breathe in (inhale), your hands move up and outwards. down inwards. When you breathe out (exhale), your hands move down and inwards. Let’s see why…. Inhaling When we inhale, our lungs fill with air. As they fill, they become enlarged. The ribs must then move upwards and outwards to make more room in the thorax. The overall effect of this is that our chest expands.

9. Inhalation (When we breathe in we inhale)

10. Exhalation (When we breathe out we exhale)

11. As you breath in, your chest moves u________ and o_______ As you breath out, your chest moves d________ and i________ Breathing in is called inhaling and breathing out is called ________.

12. Learning Objectives: 1.To be able to describe the structure of the lungs 2.To explain how the lungs clean themselves 3.To be able to explain gaseous exchange

13. Surface of bronchioles is made of 2 types of cell Goblet cells make mucus. If microbes get in they stick to it. Ciliated cells have tiny hairs called cilia. They sweep the mucus out of your lungs to your throat. Smoking stops the cilia from working, so you have to cough to get rid of mucus.

14. Explain the two ways in which the lungs are kept clean! Also answer Questions 4-6 pages:20

15. Learning Objectives: 1.To be able to describe the structure of the lungs 2.To explain how the lungs clean themselves 3.To be able to explain gaseous exchange

16. Down the windpipe Through each bronchus And through all the bronchioles within each lung BUT WHAT HAPPENS NEXT? Always remember that the CO 2 is moving in the opposite direction! Oxygen will pass

17. The alveoli are adapted to make gas exchange in lungs happen easily and efficiently. Features of the alveoli that allow gas exchange: They have moist, thin walls (just one cell thick) They give the lungs a really big surface area They have a lot of tiny blood vessels called capillaries.

18. http://www.bbc.co.uk/schools/ks3bitesize/science/orga nisms_behaviour_health/life_processes/revise5.shtml How the Alveoli works

19. The gases move by diffusion. Diffusion is the process by where gases move from a high concentration to a low concentration: Oxygen diffuses from the air in the alveoli into the blood. Carbon dioxide diffuses from the blood into the air in the alveoli. Capillary

20. Draw a picture of the alveoli from page 19 in your book. Answer question: 8.

21. What’s the difference?