− | Energy is required for growth, gestation, lactation, and physical activity. Energy provided in the form of protein, fat, or carbohydrate will ultimately be used in production of adenosine triphosphate (ATP) in the tricarboxylic acid (TCA) cycle. ATP is then used as the metabolic “fuel” to support the normal actions of the cell. | + | Energy is required for growth, gestation, lactation, and physical activity. Energy provided in the form of protein, fat, or carbohydrate will ultimately be used in production of '''adenosine triphosphate (ATP)''' in the tricarboxylic acid (TCA) cycle. ATP is then used as the metabolic “fuel” to support the normal actions of the cell. |