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Questions and Answers
What relationship does mass have with metabolic rate in animals?
What relationship does mass have with metabolic rate in animals?
- Metabolic rate generally increases as mass increases. (correct)
- Smaller animals have a higher metabolic rate relative to their size. (correct)
- Metabolic rate does not vary with the size of the animal.
- Larger animals have a higher metabolic rate relative to their size.
What does Kleiber's Law state about an animal's metabolic rate?
What does Kleiber's Law state about an animal's metabolic rate?
- It scales to the body mass raised to the 2/3 power.
- It scales linearly with body mass.
- It scales to the body mass raised to the 3/4 power. (correct)
- It scales to the body mass raised to the 0.5 power.
In the context of metabolic rates, what does the scaling exponent < 1 imply for basal metabolic rate in mammals?
In the context of metabolic rates, what does the scaling exponent < 1 imply for basal metabolic rate in mammals?
- Smaller mammals have a metabolic rate that is independent of their mass.
- Larger mammals have a proportionally lower metabolic rate than smaller mammals. (correct)
- All mammals have the same metabolic rate regardless of size.
- Metabolic rates in small mammals are higher than in larger mammals.
How can the equation for whole-animal metabolic rate be linearized?
How can the equation for whole-animal metabolic rate be linearized?
What does the term 'mass-specific metabolic rate' refer to?
What does the term 'mass-specific metabolic rate' refer to?
Which of the following equations represents mass-specific metabolic rate?
Which of the following equations represents mass-specific metabolic rate?
What is the metabolic rate of an animal measured as?
What is the metabolic rate of an animal measured as?
Which factor is considered a scaling coefficient in metabolic rate equations?
Which factor is considered a scaling coefficient in metabolic rate equations?
What happens to the metabolic rate per unit mass as body mass increases?
What happens to the metabolic rate per unit mass as body mass increases?
Flashcards
Scaling exponent
Scaling exponent
The metabolic rate of a whole animal is proportional to its mass raised to a power called scaling exponent.
Isometric Scaling
Isometric Scaling
The relationship between an animal's metabolic rate and its body mass is not linear. Larger animals have slower metabolic rates per unit of mass.
Scaling exponent < 1 for basal metabolic rate
Scaling exponent < 1 for basal metabolic rate
The scaling exponent for basal metabolic rate in mammals is less than 1, meaning larger animals have slower metabolic rates per unit of mass.
Kleiber's Law
Kleiber's Law
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Different scaling exponents for different activity states
Different scaling exponents for different activity states
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VO2max
VO2max
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Study Notes
Isometric Scaling of Metabolic Rate
- Metabolic rate generally increases with mass.
- Larger mass typically corresponds to a higher metabolic rate.
- If you take a chunk of mass from each animal and measure its metabolic rate, it would be the same.
Allometric Scaling of Metabolic Rate
- Larger animals exhibit slower metabolic rates in relation to their size.
- Metabolic rate per unit of mass decreases as the animal's size increases.
Scaling Exponent
- Metabolic rate scaling is non-linear.
- Equations exist to mathematically express the relationship (provided).
- Scaling exponents are different for different processes or states – basal metabolic rate (BMR) vs. maximum oxygen uptake (VO2max).
Kleiber's Law
- Animal's metabolic rate scales to the 3/4 power of its mass.
- A scaling exponent of approximately 0.75 is often seen across animal species.
- Differences in scaling exponents exist between groups and activities; the reasons are not yet established.
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