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Science Form 3 Chapter 1-Respiration

Short Note Of Science
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Side ASide B
1.Respiratory syst. made up of...

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and...

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2.Breathing mechanism

Inhalation:-thoraric cavity-bigger                   -air pressure in lung-lowered                  ...
3.Transport of oxygen

-oxygen dissolve in alveolus,then diffuse into blood capillaries -the blood contain red blood cell which rich with haemoglobin -oxygen+haemoglobin=oxyhaemoglobin -the blood leave...

4.Effects of harmful substances: a)Cigarette smoke
contain:tar-cause lung cancer               nicotine-cause addiction to smoking               carbon...

b)car exhaust
contain: carbon monoxide-reduce oxy. in blood

c)Industry and vehicles
contain:sulphur dioxide-damage lung tissues               hydrocarbons-cause cancer              ...
5.Diseases that affect respiratory system
-bacteria,virus&micoorganisms produce toxins in human body which cause illness -virus-cause influenza and whooping cough or  pneumonia -asbestos dust is a carcinogen which...
9.Ways to improve quality of air
a)stop smoking b)use air cleaning system to dissolve toxic gases    like sulphur dioxide in water before released    into atmosphere c)install catalyst convertors...

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