How do the cells get the raw materials that they need to respire

Your lungs infuse the blood with oxygen and get rid of the carbon diox 

the digestive system extracts glucose from the food you eat and deposits it in the blood 

the circulatory system moves the oxygen, glucose, and carbon diox through our bodies enabling the cells to get the materials they need and remove the ones they dont

It shows that the experiment is designed properly.

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