Feedback Mechanisms

The diagram best illustrates the concept of

• Recombination

• Feedback

• Digestion

• Active transport

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The most immediate response to a high level of blood sugar in a human is an increase in the

• release of insulin

• blood flow to the digestive tract

• muscle activity in the arms

• activity of all cell organelles

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The pancreas produces one hormone that lowers blood sugar level and another that increases blood sugar level. The interaction of these two hormones most directly helps humans to

• digest needed substances for other body organs.

• dispose of wastes formed in other body organs.

• maintain a balanced internal environment.

• increase the rate of cellular communication.

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Feedback interactions in the human body are important because they

• determine the diversity necessary for evolution to occur.

• direct the synthesis of altered genes that are passed on to every cell in the body.

• regulate the shape of molecules involved in cellular communication.

• keep the internal body environment within its normal range.

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• A

• B

• C

• D

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• A

• B

• C

• D

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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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Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

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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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An example of a negative feedback loop is ...

• Blood glucose regulation

• Blood pressure regulation

• Thermoregulation

• All of the above

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