Homeostasis and Feedback Mechanisms

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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NGSS.HS-LS1-3

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

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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. This is an example of a:

• Positive Feedback Loop

• Negative Feedback Loop

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NGSS.HS-LS1-3

An example of a negative feedback loop is ...

• Blood glucose regulation

• Blood pressure regulation

• Thermoregulation

• All of the above

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NGSS.HS-LS1-3

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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NGSS.HS-LS1-3

What type of feedback loop is shown?

• negative
• neutral 
• positive

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NGSS.HS-LS1-3

When a bone breaks the rate of new bone cells being made and sent to the area increases for a time until the bone is repaired. Once the bone is repaired, bone cell turnover rate slows back to normal conditions. This is an example of what type of feedback loop?

• Positive Feedback Loop

• Negative Feedback Loop

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NGSS.HS-LS1-3

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. This is an example of what type of feedback loop?

• Positive Feedback Loop

• Negative Feedback Loop

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NGSS.HS-LS1-3

If the calcium in your blood decreases below homeostasis levels, a gland in the brain will sense the decrease and send a chemical message to your bones. Your bones will release calcium into the blood, bringing blood calcium levels back up. This is an example of what type of feedback loop?

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-LS1-3

As you get dehydrated, your blood becomes thicker and harder to pump. Your kidneys will respond by stopping urine production, sending the water from urine into your bloodstream to thin your blood back to normal level. This is an example of what type of feedback loop?

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-LS1-3