5. In your groups….Think of a reason why an old man was gasping for breath. a boy’s heart was beating very fast.
6. Think of a reason why an old man was gasping for breath. (Possible answers: he has been exercising; his lungs are not working properly; he has emphysema; there is not much oxygen in the air for him to breathe.) a boy’s heart was beating very fast. What could have caused this? (Possible answers: he has been exercising; he is nervous/ anxious/worried; his body is starved of oxygen; he is using a medication such as a salbutamol inhaler; he has been taking some illegal drugs or drunk very strong coffee.)
8. Previous work Inhaled and exhaled air - more carbon dioxide and water exhaled Respiration - produces ENERGY, carbon dioxide and water - uses oxygen and glucose
13. Breathing When your muscles change the size of your lungs. Ventilation The movement of air into and out of your lungs
14. Inhaling and exhaling Inhaling The ribs move UP and the diaphragm moves DOWN. Exhaling The diaphragm moves up and the ribs move down
15. Lung volume Tidal volume – how much usually breathe in and out - how do you think this changes when you exercise? Vital capacity –amount of air can force out of lungs
16. Where does gas exchange occur? The alveolimake gas exchange in lungs happen easily and efficiently. They have moist, thin walls They give the lungs a really big surface area They have a lot of tiny blood vessels called capillaries.
17. How do the gases move? The gases move by diffusion. Diffusion is where gases move from high concentration to low concentration: Oxygen diffuses from air in the alveoli into the blood. Carbon dioxide diffuses from the blood into the air in the alveoli. Capillary
18. Why are the lungs so good? absorbing oxygen into and releasing carbon dioxide from the blood in the lungs is called gas exchange The air sacs and capillaries have thin walls The 150 million alveoli in each lung give ahuge surface area of about 100 m2.
20. Breathing/respiration/ventilation is… a process involving muscles which change the size of the thorax, the movement of air into and out of the lungs a cellular process used to release energy. Respiration breathing ventilation
21. Breathing/respiration/ventilation is… a process involving muscles which change the size of the thorax, breathing the movement of air into and out of the lungs ventilation a cellular process used to release energy. Respiration
27. Gas exchange ‘relay’ Your team has some info about gas exchange and 3 answers to write When complete come to the front to check answers You will then get the next set of questions Which team will win?
28. Damage heat and chemicals from cigarette smoke paralyse the cilia meaning that mucus gets trapped in the lungs.This increases the likelihood of infection smoke particles can cause emphysema. The particles inflame the walls ofthe alveoli, causing them to lose their elasticity.The alveoli rupture forming large air pockets. This reduces the surface area of the lungs. Prolonged exposure to dust will also cause pneumoconiosis. In this disease dust gets trapped in the lungs causing inflammation and fibrous tissue to form. Slowly this starts to kill the lung tissue. Coalminers are particularly susceptible to this.
29. Odd one out ? alveolus, air sac, trachea, breathing, bronchus stomach, lung, windpipe/trachea
30. Odd one out ? alveolus, air sac, trachea, breathing, bronchus stomach, lung, windpipe/trachea
