Energy for our activities is provided by the chemical energy of the foods we eat
ID: 1460043 • Letter: E
Question
Energy for our activities is provided by the chemical energy of the foods we eat. The absolute value of the rate of conversion of this chemical energy into other forms of energy (E/t) is called the metabolic rate. The metabolic rate depends on many factors - a person's weight, physical activity, the efficiency of bodily processes, and the fat-muscle ratio. The table lists the metabolic rates of people under several different conditions and in several different units of measure: 1 kcal = 1000 calories = 4186 J.Dieticians call a kcal simply a Cal. A piece of bread provides about 70 kcal of metabolic energy.
In 1 hour of heavy exercise a 68-kg person metabolizes 600kcal90kcal=510kcal more energy than when at rest. Typically, reducing kilocalorie intake by 3500 kcal(either by burning it in exercise or not consuming it in the first place) results in a loss of 0.45 kg of body mass (the mass is lost through exhaling carbon dioxide-the product of metabolism).
Part A
Why is the metabolic rate different for different people?
Why is the metabolic rate different for different people(choose one)?
Energy usage rate during various activities. Type of activity E/t (watts) E/tkcal/h E/t (kcal/day) 45-kg person at rest 80 70 1600 68-kg person at rest 100 90 2100 90-kg person at rest 120 110 2600 68-kg person walking 3 mph 280 240 5800 68-kg person moderate exercise 470 400 10,000 68-kg person heavy exercise 700 600 14,000Explanation / Answer
4. All the above
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