Podcast
Questions and Answers
What characterizes Positive Adaptive Homeostasis?
What characterizes Positive Adaptive Homeostasis?
Which mechanism describes the return to the basal homeostatic range?
Which mechanism describes the return to the basal homeostatic range?
Which of the following statements about signaling in homeostasis is incorrect?
Which of the following statements about signaling in homeostasis is incorrect?
How do sub-toxic signaling molecules influence homeostasis?
How do sub-toxic signaling molecules influence homeostasis?
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What best describes the role of stressors in homeostatic mechanisms?
What best describes the role of stressors in homeostatic mechanisms?
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What perspective does Day (2005) take on the concept of allostasis?
What perspective does Day (2005) take on the concept of allostasis?
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How does adaptive homeostasis differ from traditional concepts of homeostasis?
How does adaptive homeostasis differ from traditional concepts of homeostasis?
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What is an aspect criticized regarding the integration of stress and allostasis?
What is an aspect criticized regarding the integration of stress and allostasis?
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Which of the following is NOT considered a threat that can impact adaptive homeostasis?
Which of the following is NOT considered a threat that can impact adaptive homeostasis?
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What does the concept of allostatic load refer to?
What does the concept of allostatic load refer to?
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What is a potential consequence of conflating stress with the concept of allostasis?
What is a potential consequence of conflating stress with the concept of allostasis?
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What is the primary function of adaptive responses in organisms?
What is the primary function of adaptive responses in organisms?
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Which of the following is an example of positive homeostasis?
Which of the following is an example of positive homeostasis?
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How are heterostasis and allostasis conceptually similar?
How are heterostasis and allostasis conceptually similar?
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What role does emotional and psychological stress play in homeostasis?
What role does emotional and psychological stress play in homeostasis?
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What term did Hans Selye propose to describe the physiological state induced by excessive amounts of a toxin?
What term did Hans Selye propose to describe the physiological state induced by excessive amounts of a toxin?
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Which biological process was incorrectly associated with adrenal regulation by Walter Cannon?
Which biological process was incorrectly associated with adrenal regulation by Walter Cannon?
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Which of the following best illustrates a response focusing on positive homeostasis?
Which of the following best illustrates a response focusing on positive homeostasis?
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Which physiological response is primarily activated during Selye's concept of the stress response?
Which physiological response is primarily activated during Selye's concept of the stress response?
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What are the phases of General Adaptation Syndrome (GAS) as defined by Hans Selye?
What are the phases of General Adaptation Syndrome (GAS) as defined by Hans Selye?
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In the context of signal transduction pathways, what role do hormones play in stress responses?
In the context of signal transduction pathways, what role do hormones play in stress responses?
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What is a characteristic of negative homeostasis mechanisms?
What is a characteristic of negative homeostasis mechanisms?
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How is stress defined by behavioral physiologists?
How is stress defined by behavioral physiologists?
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How does aging influence the concepts of heterostasis and homeostasis?
How does aging influence the concepts of heterostasis and homeostasis?
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Which mechanism is primarily involved in maintaining homeostasis during acute stress?
Which mechanism is primarily involved in maintaining homeostasis during acute stress?
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What occurs during the exhaustion phase of General Adaptation Syndrome?
What occurs during the exhaustion phase of General Adaptation Syndrome?
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What is the primary focus of positive homeostasis mechanisms?
What is the primary focus of positive homeostasis mechanisms?
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How does homeostasis relate to the concept of normal range?
How does homeostasis relate to the concept of normal range?
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What is the role of stressors in the context of homeostasis?
What is the role of stressors in the context of homeostasis?
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Which of the following best describes negative homeostasis mechanisms?
Which of the following best describes negative homeostasis mechanisms?
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In terms of signal transduction pathways, what is a critical element when the body encounters a stressor?
In terms of signal transduction pathways, what is a critical element when the body encounters a stressor?
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Which is an example of positive homeostasis?
Which is an example of positive homeostasis?
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What characterizes chronic stressors compared to acute stressors?
What characterizes chronic stressors compared to acute stressors?
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What term is proposed to describe transient changes in the homeostatic range due to non-damaging conditions?
What term is proposed to describe transient changes in the homeostatic range due to non-damaging conditions?
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Which concept is considered inadequate when describing physiological responses to stress?
Which concept is considered inadequate when describing physiological responses to stress?
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What role do pre-existing signal transduction pathways play during cellular stress responses?
What role do pre-existing signal transduction pathways play during cellular stress responses?
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In the context of adaptive homeostasis, what is a primary function of physiological adaptations to stress?
In the context of adaptive homeostasis, what is a primary function of physiological adaptations to stress?
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Which of the following factors is NOT associated with Positive Adaptive Homeostasis?
Which of the following factors is NOT associated with Positive Adaptive Homeostasis?
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What is the primary focus when studying the role of stressors in homeostasis?
What is the primary focus when studying the role of stressors in homeostasis?
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Which statement best illustrates the concept of heterostasis?
Which statement best illustrates the concept of heterostasis?
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How do nutrient-sensing mechanisms relate to adaptive homeostasis?
How do nutrient-sensing mechanisms relate to adaptive homeostasis?
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How does one define the physiological adaptation to varying states of stress?
How does one define the physiological adaptation to varying states of stress?
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Which term describes the inadequate descriptors for physiological adaptation related to stress?
Which term describes the inadequate descriptors for physiological adaptation related to stress?
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Study Notes
Homeostasis
- Homeostasis is the maintenance of nearly constant conditions in the internal environment
- Homeostasis is depicted as a range of values around a mean or median value
- Homeostatic range is defined as the normal physiological range
- Examples of biological functions that can vary with time include blood pressure, heart rate, core temperature, blood glucose, and NAD+ levels.
- The X axis represents time, and the Y-axis represents the measured variable
- The time axis is calibrated by seconds, minutes, hours, days, weeks or years.
Heterostasis and Allostasis
- Heterostasis is a state induced by excessive amounts of a toxin
- Allostasis is the process of achieving stability through physiological change
- Allostatic load is the cost of maintaining allostasis, which can lead to disease
Adaptive Homeostasis
- Adaptive homeostasis is the transient expansion or contraction of the homeostatic range in response to sub-toxic, non-damaging signaling molecules or events
- Positive adaptive homeostasis describes a transient increase in protective homeostatic capacity
- Negative adaptive homeostasis describes a return to the basal homeostatic range after the initiating signal is removed
- Adaptive homeostasis may explain how organisms cope with environmental stresses by expanding or shrinking their homeostatic range.
Hans Selye
- Hans Selye was a pioneer in stress research
- He proposed the concept of heterostasis and contributed to the concept of allostasis
- He developed the General Adaptation Syndrome (GAS) model which describes the three stages of the body’s response to stress, namely, the alarm stage, the resistance stage, and the exhaustion stage
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Description
Explore the concepts of homeostasis, heterostasis, and allostasis in biological systems. This quiz covers the mechanisms behind physiological stability and the implications of adaptive homeostasis. Test your understanding of how these processes impact health and well-being.
