Respuesta :
The metabolic rate of an animal is most accurately determined by the amount of energy used by an animal in a given time.
The amount of energy an animal consumes over a period of time is called its metabolic rate.
Metabolic rate can be measured in joules, calories, or kilocalories per unit time. Metabolic rate is also the oxygen consumed (or carbon dioxide produced) per unit of time.
Oxygen is consumed in cellular respiration and carbon dioxide is produced as a by-product, so these two measurements indicate how much fuel is being burned.
In some cases, whole animal metabolism is given. In other cases, the metabolic rate is given by mass. For example, the amount of energy expended per gram of animal tissue per unit time.
Metabolic rates per mass are useful for making meaningful comparisons between organisms of different sizes. The baseline metabolic rate of animals is measured as basal metabolic rate (BMR) for endotherms and standard metabolic rate (SMR) for exotherms.
Both BMR and SMR are measures of metabolic rate in animals that are rested, calm, unstressed, and not actively digesting food (fasting).
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