Direct calorimetry works based on the principle that ____.
A) a rise in body temperature reflects the amount of energy expended
B) the amount of heat produced is proportional to the energy expended
C) oxygen consumption and carbon dioxide production are related to energy expenditure
D) energy expenditure can be predicted if respiration and perspiration are carefully measured

Question

Quizplus · Accepted Answer

Direct calorimetry measures the amount of heat produced by the body during physical activity and rests on the principle that the amount of heat produced is proportional to the energy expended. Therefore, option B is the correct answer. Option A is incorrect because a rise in body temperature can reflect many other factors besides energy expenditure. Option C is related to indirect calorimetry, which measures oxygen consumption and carbon dioxide production to estimate energy expenditure, and is therefore not relevant to direct calorimetry. Option D is incorrect because measures of respiration and perspiration are not sufficient to reliably predict energy expenditure.

Direct Calorimetry Works Based on the Principle That ____