BIO 202: REVIEW OF HOMEOSTASIS & FEEDBACK MECHANISMS1. Joe eats cereal and toast for breakfast, and his blood glucose level goes up. Joe's pancreas releases thehormone insulin, which encourages glucose to enter body cells. Joe's blood glucose goes down. This is anexample of:a) positive feedback|b) negative feedbackWhich organ system was helping to regulate glucose homeostasis? Pancreas2. Sally has a small paper cut that bleeds. Platelets begin to stick to the leaking part of the blood vessel. Theplatelets release a substance that attracts even more platelets to the damaged blood vessel. These additionalplatelets ALSO secrete substances that attract even MORE platelets. Finally the mass of platelets "plug" thehole in the blood vessel. This accumulation of platelets is an example of:a) positive feedbackb) negative feedback3. Harry is very hungry and prepares a large dinner. He takes several bites, and then is interrupted by a phonecall. He eats several more bites, and then has to respond to a text message. While he is texting, food reacheshis intestines, which secrete the hormone cholecystokinin (CCK), which travels in the blood to hishypothalamus to stimulate his satiety ('fullness') center. After about 20 minutes, Harry still hasn't finished allof his dinner, but he isn't hungry anymore. This is an example of:a) positive feedbackb) negative feedbackWhich organ systems were helping to regulate appetite homeostasis?4. Joan's blood has an increase in carbon dioxide content, which is detected by chemoreceptors in blood vesselsleading to the brain. Her brain responds by sending an action potential down nerves that cause an increase in herrespiratory rate. Joan starts breathing faster to exhale the excess carbon dioxide. This is an example of: a)positive feedbackb) negative feedbackWhich organ system was helping to regulate carbon dioxide homeostasis?5. Which two organ systems are primarily involved in the REGULATION of homeostasis?6. Define homeostasis:

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1. Joe cats cereal and toast for breakfast, and his blood glucose level goes up. Joe's pancreas releases the hormone insulin, which encourages glucose to enter body cells. Joe's blood glucose goes down. This is an example of: a) positive feedback| b) negative feedback Which organ system was helping to regulate glucose homeostasis? Pancreas

1. Joe cats cereal and toast for breakfast, and his blood glucose level goes up. Joe's pancreas releases the hormone insulin, which encourages glucose to enter body cells. Joe's blood glucose goes down. This is an example of: a) positive feedback| b) negative feedback Which organ system was helping to regulate glucose homeostasis? Pancreas

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter47: Processing Food And Nutrition

Section47.2: The Vertebrate Digestive System

Problem 1C: Imagine that you have just taken a bite of a chicken sandwich. List in sequence the structures...

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Explain positive feedback- use an example to support youranswer. You could include how each pathway works i.e., how is the change detected? What part of the body controls the response?
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;Make a Venn Diagram using the provided information below NEGATIVE FEEDBACK MECHANISM • Most control mechanisms in the human body are negativefeedback mechanisms• A negative feedback mechanism DECREASES theintensity of the stimulus and eliminates it• When a variable is above or below set point, integratortriggers a move in the OPPOSITE DIRECTION to reachthe set valueEx. Body temperature, blood pressure, pH and CO2 levels,blood glucose levelsPOSITIVE FEEDBACK MECHANISM• A positive feedback mechanism ENHANCES the originalstimulus to ACCELERATE activity• Integrator triggers a move in the SAME DIRECTIONtriggering an “explosive” response• Positive feedback mechanisms are less commonEx. Blood clotting, childbirth (oxytocin)
Visit this link (http://openstaxcollege.org/l/pancreas1) to view an animation describing the location and function of the pancreas. What goes wrong in the function of insulin in type 2 diabetes?
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