Multiple Choice
Which nutrient is vital for building tissues, muscles, and bones?
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4. Biomolecules
Proteins
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Which of the following factors most directly affects the use of proteins as an energy source during physical activity?
A
The intensity and duration of the exercise
B
The athlete's blood type
C
The color of the athlete's clothing
D
The amount of sunlight during exercise
Verified step by step guidance1
Understand that proteins are not the body's primary energy source; carbohydrates and fats are typically used first. Proteins are used as an energy source only under specific conditions, such as prolonged or intense physical activity when other energy reserves are depleted.
Recognize that the intensity and duration of exercise directly influence the body's energy demands. During high-intensity or long-duration exercise, the body may begin to break down proteins for energy if carbohydrate and fat stores are insufficient.
Eliminate irrelevant options: The athlete's blood type, the color of their clothing, and the amount of sunlight during exercise do not have a direct physiological impact on the use of proteins as an energy source.
Focus on the correct factor: The intensity and duration of exercise determine how quickly the body depletes its primary energy sources (carbohydrates and fats) and begins to rely on proteins.
Conclude that the correct answer is 'The intensity and duration of the exercise,' as these factors most directly affect the use of proteins as an energy source during physical activity.
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