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Questions and Answers
Which of the following is a characteristic of non-shivering thermogenesis?
Which of the following is a characteristic of non-shivering thermogenesis?
What is the purpose of the H+ leak across the inner mitochondrial membrane mediated by uncoupling proteins?
What is the purpose of the H+ leak across the inner mitochondrial membrane mediated by uncoupling proteins?
What is the function of brown fat?
What is the function of brown fat?
What happens at and above the UCT (upper critical temperature)?
What happens at and above the UCT (upper critical temperature)?
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What is the purpose of regional endothermy in fish?
What is the purpose of regional endothermy in fish?
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What is the purpose of a rete mirabile?
What is the purpose of a rete mirabile?
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Which of the following is a characteristic of regional endothermy in tuna?
Which of the following is a characteristic of regional endothermy in tuna?
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Why did regional endothermy evolve in bony fishes?
Why did regional endothermy evolve in bony fishes?
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Which of the following is a characteristic of endothermic homeotherms?
Which of the following is a characteristic of endothermic homeotherms?
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What is the equation for power required to maintain a heated object at a set point temperature of 37 °C?
What is the equation for power required to maintain a heated object at a set point temperature of 37 °C?
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What effect does insulation have on the power required to maintain the set point temperature?
What effect does insulation have on the power required to maintain the set point temperature?
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What is the equation for power in the physical model when air temperature is 37 °C?
What is the equation for power in the physical model when air temperature is 37 °C?
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What is the equation for power in the physical model when air temperature is not 37 °C?
What is the equation for power in the physical model when air temperature is not 37 °C?
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What is the equation for power in the physical model for endothermic homeotherms?
What is the equation for power in the physical model for endothermic homeotherms?
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What is the cause of shivering in endothermic homeotherms?
What is the cause of shivering in endothermic homeotherms?
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Which of the following is true about the thylakoid reactions in photosynthesis?
Which of the following is true about the thylakoid reactions in photosynthesis?
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What is the energy source for the thylakoid reactions in photosynthesis?
What is the energy source for the thylakoid reactions in photosynthesis?
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What can be used to measure the rate of photosynthesis?
What can be used to measure the rate of photosynthesis?
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What is the function of pigments in photosynthesis?
What is the function of pigments in photosynthesis?
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What does the absorption spectrum of a leaf represent?
What does the absorption spectrum of a leaf represent?
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What is the purpose of the light harvesting complex in photosynthesis?
What is the purpose of the light harvesting complex in photosynthesis?
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What is the role of the photosynthetic electron-transport chain?
What is the role of the photosynthetic electron-transport chain?
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Which part of the chloroplast is responsible for the light-dependent reactions of photosynthesis?
Which part of the chloroplast is responsible for the light-dependent reactions of photosynthesis?
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What is the role of plastocyanin in photosynthesis?
What is the role of plastocyanin in photosynthesis?
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What is the primary enzyme involved in the carbon fixation reactions of photosynthesis?
What is the primary enzyme involved in the carbon fixation reactions of photosynthesis?
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What molecule is produced during the carboxylation step of the Calvin-Benson cycle?
What molecule is produced during the carboxylation step of the Calvin-Benson cycle?
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What happens if the capacities of the electron transport chain and the Calvin-Benson cycle are mismatched?
What happens if the capacities of the electron transport chain and the Calvin-Benson cycle are mismatched?
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Which process is largely temperature-independent in photosynthesis?
Which process is largely temperature-independent in photosynthesis?
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Which of the following is a characteristic of the Rubisco enzyme?
Which of the following is a characteristic of the Rubisco enzyme?
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What is the primary function of the xanthophyll cycle in photosynthesis?
What is the primary function of the xanthophyll cycle in photosynthesis?
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Study Notes
Endothermy and Thermoregulation in Organisms
- Endothermic homeotherms maintain a high and stable body temperature using internal heat and have a high basal metabolic rate.
- Ectotherms, on the other hand, rely on external sources of heat to regulate their body temperature.
- A physical model shows that insulation reduces the power required to maintain a set point temperature.
- Endothermic homeotherms deviate from the physical model and have a minimum energy expenditure.
- The Scholander Curve describes the relationship between metabolic rate and body temperature in endotherms.
- Conductance in endotherms can be changed through vasomotor responses, pilomotor responses, postural changes, and regional heterothermy.
- Cold adapted animals have lower thermal conductance than tropical animals.
- Seasonal acclimatization to cold tolerance can be achieved through metabolic adjustment or changes in pelage (insulation).
- Excess heat production in endotherms can occur through shivering or non-shivering thermogenesis.
- Brown fat is specialized for non-shivering thermogenesis.
- Heat loads in endotherms can be stored or lost through increasing body temperature or evaporation.
- Regional endothermy has evolved in bony fishes on at least three separate occasions, allowing them to migrate through water of different temperatures and improve their performance as predators.
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Description
Test your knowledge of endothermy and its importance in organismal physiology with this quiz. Learn about the high basal metabolic rate, heat retention mechanisms, and the differences between ectotherms and endotherms. Get ready to explore the fascinating world of maintaining a stable body temperature.
