The document provides information about the respiratory system. It describes the pathway air takes from the nose to the lungs and the process of gas exchange that occurs in the alveoli. During inspiration, muscles like the diaphragm and intercostals contract to expand the lungs and pull air in. During expiration, these muscles relax and the lungs are compressed to push air back out. Oxygen diffuses into the blood in the alveoli while carbon dioxide diffuses out of the blood and into the alveoli to be breathed out.

1. Respiration BTEC Sport Miss Bowe

2. Breathe: do steps 1,2,3 and 4 Come in and find which table has your name Take your coat, hat, scarf off and sit down quietly Stop talking, making noises and listen During the lesson, speak only when I ask a question or when I ask you to work with a partner or in a group. Warnings will be given for ANY disruptive behaviour Rewards will be given for POSITIVE contributions

3. Objectives Understand what the cardio-respiratory system is Label the pathway airs takes from the nose to the lungs Describe gas exchange and where it takes place Describe what happens when we Breath in (inspiration) Breath out (expiration)

4. The Cardiac System (The Heart) The Respiratory System (The Lungs) The Cardio - RespiratorySystem (The Heart AND the Lungs working together)

5. Capillaries Capillaries Muscle The Cardio-Respiratory System Aorta Veins Arteries Vena Cavae O2 CO2 Venules Arterioles

7. The removal of carbon dioxideThe Respiratory System

8. The Respiratory System Structure Mouth Epiglottis Trachea Bronchus Lung

9. Structure of the lung Trachea Bronchus Bronchioles Alveoli

10. Muscles involved in breathing Diaphragm A domed shaped muscle at the bottom lungs and ribs Intercostals Muscles found in between each rib to help them move

11. How do we make space for the O2 coming in? Air is sucked down the wind pipe and into the lungs The intercostal muscles contract, allowing rib cage moves upwards and outwards. The lungs expand to allow more air in The diaphragm contracts and pulls down to make the chest larger INSPIRATION (breathing in)

12. How do we force the CO2 back out again? When we breath out we squeeze the carbon dioxide out The lungs are compressed, pushing air out of the lungs and up the windpipe Intercostal muscles relax, lowering the rib cage and making the chest smaller The diaphragm also relaxes to make the chest smaller Video: muscles involved in inspiration and expiration EXPIRATION (breathing out)

13. Breathing in and out ... Breathing in … is hard work therefore we CONTRACT Breathing out … is easy therefore we RELAX Try it now … listen to this track and breathe in and out Can you see your body creating space for the oxygen when you breathe in?

15. Site of gaseous exchange

16. Oxygen O2 diffuses into the blood

19. The alveoli is surrounded by a massive blood supply

20. The alveoli are covered in tiny capillaries

21. Oxygen can pass through the thin walls of each alveoli and capillary, and into the blood

22. Carbon Dioxidecan pass from the blood stream and capillaries andinto the alveolus

23. O2 ALVEOLI Capillary (Oxygenated blood) Bronchiole Alveoli O2 Alveoli CO2 Rich blood

24. Capillary Bronchiole Alveoli CO2 Alveoli CO2 Rich blood ALVEOLI Capillary (Deoxygenated blood)

25. A summary of the respiratory system… Watch the video and if you need to make notes… … there will be a game show style quiz after