Feedback Mechanisms

When the level of glucose in the blood is too high, the pancreas secretes insulin. The insulin causes the blood glucose to decrease. When the blood glucose becomes too low, the pancreas secretes glucagon. The glucagon cause the blood glucose to increase. What does this process represent?

• Negative feedback

• Positive feedback

• Neutral feedback

• Diabetes

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The diagram shows the feedback mechanism that maintains body temperature.

If a person's body temperature gets too high, how does the body respond in order to maintain homeostasis?

• An increase in blood sugar.

• Releasing insulin.

• Shivering

• Sweating

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What is another word that can be used to describe "homeostasis"?

• Stable

• Equal

• Complete

• Correct

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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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When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed.

• Positive Feedback

• Negative Feedback

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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.

• Positive Feedback Response

• Negative Feedback Loop

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Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

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The process of childbirth is an example of:

• negative feedback loop
• positive feedback loop

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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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Failure to maintain homeostasis could result in:

• lack of internal balance
• eventual death
• difficulty carrying on metabolism 
• all three

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