Respuesta :
In a well-nourished human, proteins are the energy substrate that will make the smallest contribution to energy production during physical activity and during rest.
Proteins are the polymers of amino acids. They are essentially required for the synthesis of nucleotides inside the body. However, when required to breakdown to gain energy they are the last ones to be broken down. This is because breakdown of proteins is an expensive process.
Energy substrate are the components that act as the starting source for energy production. The examples of energy substrate are: carbohydrates, fats and proteins. The energy produced is generally in the form of ATP.
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