Healthy Bodies Unit One. By the end of this unit you should ;- 1. Know where your lungs and windpipe are. 2. Know that in the lungs,oxygen from the air enters the blood. 3. Know that in the lungs,carbon dioxide leaves the blood and gets breathed out.
2. This called smog and is caused by exhaust fumes from cars.Air Pollution
2. The left side of the heart takes blood from the lungs and pumps it to all parts of the body.The Heart.
2. To prevent blood from flowing backwards,the veins have valves.
3. Valves are like doors which only open one way.Valves.
The chemical called haemoglobin makes the blood red.Red blood cells.
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