In a study, researchers put human participants on a treadmill for 10 minutes and then drew blood samples. They found that blood levels of certain "exercise metabolites" increased after the participants exercised. When the researchers added these "exercise metabolites" to mouse muscle cells cultured in a lab dish, the cells increased the rate at which they were burning

Answer is fat.

Explanation:

Metabolism Are processes, usually chemical processes , which are required or needed in the body to sustain or maintain life.

Metabolism can be breaking down of complex molecules to obtain energy, known as catabolism, or building up of complex molecules through energy use.

Metabolites are involved in and essential in metabolism. At times they might be products of metabolism. Examples are fructose and glucose .

In this case, the exercised metabolites  that were found in the human were products of metabolism and they give energy. They were able to increase the rate at which fats are burning in the mouse because they acts on fats to supply or give energy to the body.

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