Science Form 3 Chapter 1-Respiration

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Short Note Of Science

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1.Respiratory syst. made up of...


2.Breathing mechanism

Inhalation:-thoraric cavity-bigger -air pressure in lung-lowered -air force into lungs Exhalation:-thoraric cavity-smaller air pressure in lung-increased -air forced out of lung
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 lung and carried to the heart,then disstribute to all pats of body

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

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

c)Industry and vehicles
contain:sulphur dioxide-damage lung tissues hydrocarbons-cause cancer nitrogen oxide-interacts with hydrocarbons to form haze
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 cause lung cancer
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 on vehicle exhaust pipe to reduce dangerous gases like carbon monoxide