Why we need a ventilation system

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Explain the need for a ventilation system

Respiration - characteristic of life. 

Biological meaning - release of energy. Cellular respiration goes on in every living cell. Most cells require a constant supply of oxygen to finction. 

Large organisms need to maintain a gas exchange and therefore a smaller surface area over volume ration. The decrease of surface area over volume ration is rapid as the size of the organism increases. 

Example 1

the smaller cube:

The surface area is 6 x 1 x 1 cm2 = 6 cm


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