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1.Respiratory syst. made up of...
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and...
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2.Breathing mechanism
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Inhalation:-thoraric cavity-bigger
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3.Transport of oxygen
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-oxygen dissolve in alveolus,then diffuse into
blood capillaries
-the blood contain red... |
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4.Effects of harmful substances:
a)Cigarette smoke |
contain:tar-cause lung cancer
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b)car exhaust |
contain: carbon monoxide-reduce oxy. in blood
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c)Industry and vehicles |
contain:sulphur dioxide-damage lung tissues
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5.Diseases that affect respiratory system
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-bacteria,virus&micoorganisms produce toxins in human body which cause illness
-virus-cause...
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9.Ways to improve quality of air
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a)stop smoking
b)use air cleaning system to dissolve toxic gases
like sulphur...
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