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Questions and Answers
What is the main purpose of homeostasis in organisms?
What is the main purpose of homeostasis in organisms?
- To enhance the intensity of internal conditions
- To maintain a stable internal environment (correct)
- To eliminate all external stimuli
- To prevent any changes in the environment
Which of the following best describes a stimulus in the context of homeostasis?
Which of the following best describes a stimulus in the context of homeostasis?
- The result of an organism's response to external factors
- An internal condition that remains constant
- A mechanism that stabilizes a system's output
- A change in the environment that triggers a response (correct)
In a positive feedback mechanism, what typically happens to the output of a system?
In a positive feedback mechanism, what typically happens to the output of a system?
- It causes immediate shutdown of the system
- It enhances the output of the system's response (correct)
- It diminishes over time, stabilizing the system
- It has no effect on the system's response
What occurs in a negative feedback loop?
What occurs in a negative feedback loop?
Which of the following is an example of a positive feedback mechanism?
Which of the following is an example of a positive feedback mechanism?
Flashcards
Homeostasis
Homeostasis
Maintaining stable internal conditions despite environmental changes.
Positive Feedback Loop
Positive Feedback Loop
A loop where the output increases the response.
Negative Feedback Loop
Negative Feedback Loop
A loop where the output decreases the response.
Stimulus
Stimulus
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Dynamic Equilibrium
Dynamic Equilibrium
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Study Notes
Homeostasis and Cell Transport
- Organisms maintain internal stability through homeostasis
- Organisms respond to stimuli (changes in environment)
- Responses help maintain homeostasis
- Mechanisms evolve to help maintain homeostasis as organisms respond to stimuli
- Mechanisms use the input of a system to signal a change
Positive Feedback Mechanisms
- In a positive feedback loop, the system output intensifies the response
- Examples:
- Childbirth: Hormones cause contractions, increasing pressure, releasing more hormones, and further intensifying contractions
- Fruit ripening: Ripening fruit releases ethylene gas, causing neighbor fruit to ripen, releasing more ethylene, etc.
Negative Feedback Mechanisms
- In a negative feedback loop, the system output causes a counter-response to return to a set point
- Examples:
- Human body thermoregulation (temp)
- Osmoregulation (fluid balance)
- Blood sugar regulation
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