Feedback 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 maintenance of an organism’s internal environment is called:

• compensating

• homeostasis

• balancing

• routine

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Maintaining body temperature is an example of a:

• negative feedback loop

• positive feedback loop

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Failure to maintain homeostasis could result in:

• lack of internal balance

• eventual death

• difficulty carrying on metabolism 

• all three

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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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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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If the environment gets cold, we will often shiver in order to:

• keep body temperature the same as the external temperature

• decrease body temperature

• increase body temperature

• regulate blood pressure

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Which of the following is an example of positive feedback?

• Thermoregulation

• Blood Pressure

• Childbirth

• Blood Sugar Levels

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