why is respiration called a complex process
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Because it is not the process of only taking in oxygen and giving out carbon dioxide it is a biochemical process.It starts through nose from where air goes into our body,nose hair and mucus helps in filtring of dust particles.Then it travel down the wind pipe and enters the lungs then in bronchioles and at last alveoli where the pure oxygen get mixed with blood this blood then goes into different cells and inside mitochondria this oxygen is used for the combustion of glucose into energy in the form of ATP.
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