The air is very important for the life of the living organisms.
In fact, by it we take the necessary oxygen to the energy production processes which are at the base of life and of the cellular activity.
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The air we breathe changes according to our physical activity: when we are resting we breathe 9 litres of air per minute, if we are doing a light physical activity we breathe 60 litres per minute and they become 130 when we are doing an under stress physical activity.

All this air is filtered by the forwardlungs.