Answer:
To tell you the truth they are not similar at all. They have nothing to do with each other. I guess the way they work secrete or take in can be compared but they are different processes. Cellular respiration is when we humans take in oxygen and glucose(food). We use the glucose to carry out many of cell activities which is transferred through our blood and dilivered to our cells. Glucose is then converted to ATP energy by the mitochondria(mitochondria plural). ATP is the cells source of energy. The role that oxygen plays is the combination of oxygen(o2) and glucose which makes water(h2o) which is also used by our cells. A waste would be the carbon dioxide made which is excreted and used by plants for photosynthesis. I guess the thing that might relate would be that to get the oxygen, you need your resperatory system.