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Questions and Answers
What does the metabolic rate of an animal refer to?
What does the metabolic rate of an animal refer to?
- Total energy expenditure over time (correct)
- Energy required for growth only
- The energy stored in body fat
- The energy needed for digestion
Which statement best describes homeostasis?
Which statement best describes homeostasis?
- A method of energy storage in organisms
- An energy-consuming biological process
- A mechanism for maintaining stable internal conditions (correct)
- A process for increasing metabolic activity
If an animal has a high metabolic rate, which characteristic is likely true?
If an animal has a high metabolic rate, which characteristic is likely true?
- It can sustain high energy levels over time (correct)
- It performs well in low temperature environments
- It requires fewer calories for survival
- It has adaptations for energy conservation
Which factor is not typically associated with metabolic rate?
Which factor is not typically associated with metabolic rate?
How is metabolic rate primarily measured?
How is metabolic rate primarily measured?
Flashcards
Metabolic rate
Metabolic rate
Total energy used by an animal per unit of time.
Homeostasis mechanisms
Homeostasis mechanisms
Processes that maintain stable internal conditions.
Animal metabolic rate units
Animal metabolic rate units
Measured in a unit of energy over a unit of time.
Homeostatic process
Homeostatic process
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What is homeostasis?
What is homeostasis?
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Study Notes
Metabolic Rate
- Metabolic rate is the sum of all energy an animal uses in a unit of time
- Determined by:
- Amount of oxygen consumed
- Amount of carbon dioxide produced
- Energy content of food consumed
- Energy lost as waste
- Size and metabolic rate are proportionally related, with smaller animals having higher metabolic rates per unit body mass (BMR) than larger animals. BMR scales proportionally to body mass raised to the power of 3/4 (m^0.75).
Endocrine System
- Releases hormones into the bloodstream, affecting many cells slowly
- Works in conjunction with the nervous system for rapid, targeted communication between specific locations within the body.
- The hypothalamus connects both systems
Temperature Regulation
- Endotherms generate heat by metabolism and maintain stable internal temperature
- Ectotherms gain heat from external sources and have lower metabolic rates
- Temperature conformers have body temperatures that change with the environment
Positive and Negative Feedback
- Positive feedback amplifies a change, moving a system further from equilibrium (e.g., childbirth, blood clotting)
- Negative feedback counteracts a change, bringing a system back to equilibrium (e.g., regulation of blood glucose, body temperature).
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