Feedback Mechanisms Review

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 Response

• Negative Feedback Loop 

Answer explanation

The process described in the question is a Positive Feedback Response. When skin cells release hormones signaling platelets to stop bleeding, and platelets release more hormones to attract even more platelets, it amplifies the response until the cut is closed. This amplification is characteristic of a positive feedback loop, as opposed to a negative feedback loop, which works to maintain stability and balance.

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NGSS.HS-LS1-3

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 

Answer explanation

The process described in the question is a Negative Feedback Loop. This is because when glucose levels rise, the body responds by releasing insulin to lower these levels. This is a classic example of a negative feedback loop, where the body responds to a change by initiating a response to counteract it and restore balance.

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NGSS.HS-LS1-3

What is homeostasis?

• the process of maintaining relatively stable internal conditions

• All the physical and chemical changes occurring in an organism

• the process of becoming bigger

• Movement of substances throughout the body

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NGSS.HS-LS1-3

What is the role of a receptor in helping an organism maintain homeostasis? Choose the correct answer

• It receives messages sent by the control center

• It carries out a response to restore internal conditions

• It detects stimuli and sends information to the control center

• It compares current conditions with ideal values for those conditions.

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NGSS.MS-LS1-8

Which of these does homeostasis most directly relate to? Choose the correct answer.

• Stability

• Evolution

• Scale and structure

• Interacting systems

The pancreas detects the amount of glucose in the blood. What does the pancreas release if blood sugar is too LOW?

• The pancreas releases glucagon if blood sugar is too low

• The pancreas releases insulin if blood sugar is too low

• The pancreas releases glucose if blood sugar is too low

• The pancreas releases beta cells if blood sugar is too low

What is the correct order of organization?

• cells->tissue->organs->organ systems-> organism

• tissue->cells->organs->organ systems-> organism

• organs->organ systems-> organism->cells->tissue

Answer explanation

The correct order of organization in biology starts from the smallest unit, which is the cell. Cells combine to form tissues, which in turn combine to form organs. Multiple organs working together form an organ system, and all the organ systems together form an organism. Hence, the correct order is cells, tissues, organs, organ systems, and finally, the organism.

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NGSS.MS-LS1-1

NGSS.MS-LS1-3

Use the image above to answer the following question:

In controlling our body temperature, our body works hard to make corrections to maintain a normal temperature. This is an example of

• negative feedback

• positive feedback

Answer explanation

In controlling our body temperature, our body works to maintain a normal temperature through a process called negative feedback. This mechanism involves the body making corrections to counteract changes in temperature, ensuring a stable internal environment. Positive feedback, on the other hand, amplifies changes rather than counteracting them.

The "cause" for something to happen is the

• response
• effect
• stimulus
• homeostasis

The "effect" of a given stimulus is the...

• response
• stimulus
• cause
• result

Tags

NGSS.MS-LS1-8