There are several processes used to explain the removal of dirts or contaminants from surface, but the general name is called Cleaning
Cleaning is an umbrella name that involves the removal of visible soils mater from surfaces, there are other types of cleaning that involves the removal of non-visible matter from surface too e.g sterilisation.
Sterilisation refers to specific action taken to reduce the hazard posed by such contaminants, as opposed to general cleaning.
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The alveoli is where the oxygen moves out of the lungs and into the blood. At the same time carbon dioxide moves out of the blood and into the lungs to be exhaled.
