Feedback and Homeostasis

The two types of feedback systems that help organisms maintain homeostasis are:

• positive and negative 

• receptor and effector

• static and dynamic

• minor and major

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When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. This is an example of a:

• Positive Feedback Loop

• Negative Feedback Loop

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Homeostasis

• allows for a wildly fluctuating internal environment

• is impossible in vertebrates

• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation

• is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation

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The tendency of an organism to maintain a balanced state in order to stay healthy.

• Stimuli

• Response

• Tropism

• Homestasis

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Maintaining body temperature is an example of a:

• negative feedback loop

• positive feedback loop

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Negative Feedback Loops:

• amplify processes

• prevent small changes from getting larger

• are initiated during childbirth

• are found only in plants

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In a negative feedback loop, what happens to a variable (like temperature) when it increases past its normal state?

• It continues to increase.

• It decreases until it resumes its normal state.

• It decreases until it is lower than its normal state.

• It does not change.

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When you are cold, you shiver and your blood vessels contract, which warms you up. When you are hot, you sweat and your blood vessels expand, which cools you down.  

• Positive Feedback Response

• Negative Feedback Loop 

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When you are hot, your body sweats to cool you down. This means your temperature went above normal and your body sweats to counteract that change to bring you back to normal. What kind of feedback loop would this be?

• Negative Feedback Loop

• Positive Feedback Loop

• Neutral Feedback Loop

• Linear Feedback Loop

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This feedback system amplifies a change until a desired outcome is reached.

• positive feedback system

• negative feedback system

• neutral feedback system

• self-monitoring feedback system