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Depends what you mean by respiration? But generally both of these things can occur simultaneously in the body.

For cellular respiration, glucose (or other sugars)either complex or simple ingested into your body are broken down by your digestive system where there are absorbed by the villi in your gastrointestinal tract, once absorbed into the cytosol, the glucose molecule is broken down into two pyruvate molecules, these molecules are then transferred using a bridging reaction into the mitochondria, after this occurs oxidative phosphorylation acts and yields 34 ATP's per molecule of glucose.

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