Feedback Mechanisms

What is the primary purpose of feedback in biological systems?

• To increase the speed of chemical reactions

• To maintain stability and balance

• To produce energy

• To eliminate waste

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DOK Level 1: Recall

Which of the following is an example of positive feedback?

• Regulation of blood sugar levels

• Blood clotting process

• Body temperature regulation

• Water balance in the kidneys

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DOK Level 1: Recall

Identify the type of feedback mechanism that reduces the effect of a stimulus.

• Positive feedback

• Negative feedback

• Neutral feedback

• Amplifying feedback

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DOK Level 1: Recall

Explain how a negative feedback mechanism works in maintaining homeostasis.

• It amplifies changes to move the system away from its set point.

• It reduces changes to bring the system back to its set point.

• It maintains changes without any adjustment.

• It ignores changes and allows the system to fluctuate.

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DOK Level 2: Skill/Concept

Which of the following best describes a positive feedback loop?

• It stabilizes a system by counteracting changes.

• It enhances or amplifies changes in a system.

• It maintains a constant internal environment.

• It prevents any change from occurring.

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DOK Level 1: Recall

In the context of homeostasis, what role does negative feedback play?

• It disrupts the balance of the internal environment.

• It helps to restore the balance of the internal environment.

• It accelerates the imbalance of the internal environment.

• It has no effect on the internal environment.

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DOK Level 1: Recall

Describe a scenario where positive feedback is beneficial in a biological system.

• When a system needs to be stabilized quickly.

• During childbirth to intensify contractions.

• To maintain constant blood pressure.

• To regulate blood glucose levels.

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DOK Level 2: Skill/Concept

What is the main difference between positive and negative feedback mechanisms?

• Positive feedback reduces changes, while negative feedback amplifies them.

• Positive feedback amplifies changes, while negative feedback reduces them.

• Both feedbacks amplify changes.

• Both feedbacks reduce changes.

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DOK Level 1: Recall

How does the body use feedback mechanisms to regulate blood glucose levels?

• Positive feedback increases glucose levels continuously.

• Negative feedback decreases glucose levels when they are too high.

• Positive feedback decreases glucose levels when they are too high.

• Negative feedback increases glucose levels continuously.

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DOK Level 2: Skill/Concept

Which of the following is NOT a characteristic of a negative feedback mechanism?

• It stabilizes a system.

• It counteracts changes.

• It amplifies changes.

• It maintains homeostasis.

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DOK Level 1: Recall