Your stomach starts rumbling during your Anatomy and Physiology lecture. As soon as class is over, you decide to hit the snack area. You see your favorite candy bar in one of the snack machines and you cannot resist. Your blood glucose level before eating this snack is 90mg/100ml (normal). As you digest and then absorb the sugar in the candy, the level of glucose in your blood increases to 120mg/100ml. The increased level of glucose is detected by receptors on pancreatic beta cells. These receptors send a signal into the beta cells, informing them of the excessive glucose in the blood. The pancreatic beta cells release insulin. The insulin travels through the blood and stimulates the liver and body cells. The liver and body cells remove the extra glucose from the blood, reducing your blood glucose back to its original level of 90mg/100ml. At this point, the release of insulin stops. What is the stimulus of this control loop?______________ What is the control center? _ What is the effector? _ In this feedback mechanism, insulin is acting as the (receptor / afferent pathway / efferent pathway). (Circle one of the terms in bold.) This is an example of (positive/negative) feedback. How could you tell?

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Homeostasis Cases

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Case #1:

Your stomach starts rumbling during your Anatomy and Physiology lecture. As soon as class is over, you decide to hit the snack area. You see your favorite candy bar in one of the snack machines and you cannot resist. Your blood glucose level before eating this snack is 90mg/100ml (normal). As you digest and then absorb the sugar in the candy, the level of glucose in your blood increases to 120mg/100ml. The increased level of glucose is detected by receptors on pancreatic beta cells. These receptors send a signal into the beta cells, informing them of the excessive glucose in the blood. The pancreatic beta cells release insulin. The insulin travels through the blood and stimulates the liver and body cells. The liver and body cells remove the extra glucose from the blood, reducing your blood glucose back to its original level of 90mg/100ml. At this point, the release of insulin stops.

What is the stimulus of this control loop?______________
What is the control center? _ ________________________
What is the effector? _______________________________
In this feedback mechanism, insulin is acting as the (receptor / afferent pathway / efferent pathway). (Circle one of the terms in bold.)
This is an example of ______ (positive/negative) feedback. How could you tell?

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