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When the person is tired he need glucose. digestion means   the food which we eat the intestines separate the food materials and send the waste materials in the form of excretion.                                                                                                                                  
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"break down" of the food particle from the large organic molecules to simple absorbable substances for the proper growth and maintainence.this process of breakdown is known as digestion.
we need glucose to maintain the amount of insulin in our body.
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