The main contributor to daily energy expenditure for the average person is the:

Question

BlackTom AI · Accepted Answer

When considering daily energy expenditure, several components contribute to total energy use, each with its own typical share.
Option a: thermic effect of physical activity refers to energy expended during intentional movement and exercise, which can vary widely between individuals and days and generally constitutes a smaller portion than rest of the day for the average person.
Option b: thermic effect of a meal represents the energy used for digestion, absorption, and metabolism of nutrients; while it does contribute, its share is typically modest and transient, not the dominant portion of daily expenditure.
Option c: resting metabolic rate is the energy required to maintain basic physiological functions at rest, such as breathing, circulation, and cellular processes; for the average person, this forms the largest baseline component of daily energy expenditure, typically around the majority of the total when activity is accounted for, making it the main contributor among the options.
Option d: none of the above would imply that none of the listed components contribute significantly, which contradicts well-established metabolic knowledge that at least RMR, TEF, and activity-related costs all play roles, with RMR generally being the largest.
In summary, the major, steady daily energy cost tends to arise from resting metabolic processes, while activity-related costs and meal-related costs are add-ons that vary, but rarely surpass resting energy needs on an average day.

The main contributor to daily energy expenditure for the average person is the:单项选择题

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The greatest contributor to the average persons daily energy expenditure is:

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