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Breathing

Brad Ford

I igcse revision

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Across
2.Breathing out
5.Volume of air moving in and out when breathing deeply
7.Carries deoxygenated blood to the lungs
9.Test for carbon dioxide
10.Site of gas exchange
13.The diaphragm is this shape when breathing out
14.Fluid filled space around both lungs
17.Made when cells do not have enough oxygen to respire aerobically
19.Addictive drug found in tobacco
20.Breathing in
Down
1.Apparatus to study breathing rate a n lung volumes
3.Found in red blood cells leaving the lungs
4.Contract when breathing in
6.Supports the walls of the airways
8.Windpipe
11.Release of energy from food
12.Form an extensive network over the lung surface
15.Movement of gases from an area of high conentration to an area of lower concentration
16.Tiny hair-like structures which waft mucus away from the lungs
18.Carcinogenic

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