Maintaining homeostasis involves feedback, which is data that feeds back to control a response. Feedback may be negative or positive. All the feedback mechanisms that maintain homeostasis use negative feedback. Biological examples of positive feedback are much less common.
Any homeostatic process that changes the direction of the stimulus is a negative feedback loop. It may either increase or decrease the stimulus, but the stimulus is not allowed to continue as it did before the receptor sensed it. In other words, if a level is too high, the body does something to bring it down, and conversely, if a level is too low, the body does something to make it go up. Hence the term negative feedback. An example is animal maintenance of blood glucose levels. When an animal has eaten, blood glucose levels rise. This is sensed by the nervous system. Specialized cells in the pancreas sense this, and the hormone insulin is released by the endocrine system. Insulin causes blood glucose levels to decrease, as would be expected in a negative feedback system. However, if an animal has not eaten and blood glucose levels decrease, this is sensed in another group of cells in the pancreas, and the hormone glucagon is released causing glucose levels to increase. This is still a negative feedback loop, but not in the direction expected by the use of the term “negative.”
A positive feedback loop maintains the direction of the stimulus, possibly accelerating it. Few examples of positive feedback loops exist in animal bodies, but one is found in the cascade of chemical reactions that result in blood clotting, or coagulation. As one clotting factor is activated, it activates the next factor in sequence until a fibrin clot is achieved. The direction is maintained, not changed, so this is positive feedback
someone help please Week 9 Discussion Question Title: Mechanisms of Homeostasis Explain the feedback control in...
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Use the homeostasis lab to answer the question below. The negative feedback mechanisms involved with maintaining the homeostasis of blood sugar are very complicated. Consider how you could design an investigation to better understand these mechanisms using the homeostasislab. Which questions could be explored in this manner? Mark all that apply. ve the homeostasis lab to answer the question below. The negative feedback mechanisms involved with maintaining the homeostasis of blood sugar are very complicated. Consider how you could design...
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Compare and contrast negative vs. positive feedback mechanisms. Provide a physiological example for each system
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Negative and positive feedback systems both have their roles in physiology. Compare and contrast these two types of feedback systems and provide a biological example of each, illustrating how it works. Which, if any, of these two types of feedback are involved in the maintenance of homeostasis? Explain.
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1. Explain why unlike negative feedback, positive feedback is not a common feature of hormone pathways that help to maintain homeostasis glands origin and function? Ca2+ level near the set point? individual and an individual with diabetes mellitus 2. Explain how iodine affects the functioning of the thyroid 3. How do the two fused glands of the pituitary gland differ in 4. How does calcitonin and parathyroid hormones maintain 5. Explain the control of blood glucose in both a healthy...
add reference please This is a graded discussion: 10 points possible duel Week 9: Discussion 1) Discuss the differences between verbal and non-verbal communication. 2) Give at least 3 examples of each (be specific and provide details as appropriate). Use examples from your readings, "Communicating with Patients in Crisis" and "Communicating Effectively with Patients Displaying Significant Negative or Resistive Coping Responses" Remember to include a reference and in-text citations in APA formatting Search entries or author Unread ✓ Subs Reply