Homeostasis & Cell Specialization

Which of the following is an example of positive feedback to indirectly maintain homeostasis?

• the chemical reactions involved in blood clotting
• your blood vessels dilate and you begin to sweat in response to elevated body temperature
• your blood vessels constrict and you begin to shiver in response to low body temperature
• your coach compliments you on your performance in practice

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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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Homeostasis in the human body is often maintained by a: 

• neutral feedback loop 
• solar feedback loop
• positive feedback loop
• negative feedback loop

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Positive feedback is when the change caused by the stimulus is

• decreased
• non existant
• increased
• changes constantly

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Which organs make up the circulatory system?

• the heart and blood vessels

• the brain, spinal cord, and nerves

• the kidneys, bladder, and ureters

• bones

Which two systems work together to maintain homeostasis while transporting oxygen throughout the body and removing carbon dioxide?

• circulatory and respiratory

• respiratory and excretory

• circulatory and digestive

• respiratory and digestive

What is an example of a positive feedback mechanism?

• 
• 

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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.

• Positive Feedback Response
• Negative 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. 

• Positive Feedback Response
• Negative Feedback Loop 

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What hormone is produced in the pancreas that lowers blood sugar?

• Insulin

• Glucagon

• Ketones

• Glucose