About what fraction of the calories a person burns in a day go toward sustaining basic body functions included in the basal metabolic rate?

1. The basal metabolic rate accounts for the energy needed to sustain basic body functions even without any deliberate physical activity. 2. About 75% of the calories a person burns in a day go into these basic functions alone. 3. That leaves only about a quarter of daily calorie burn for movement and other voluntary activity. 4. 10%, 25%, and 50% are each well below the stated 75% figure for how much of daily energy use is devoted to basic functions. _Source: OpenStax College Physics (CC BY 4.0), Ch 7 "Work, Energy, and Energy Resources", section 7.8 Work, Energy, and Power in Humans_