Select the statements that correctly describe positive feedback pathways. A sensor/receptor is required to monitor and limit levels. A sensor/receptor is unnecessary to monitor and limit levels.
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Select the statements that correctly describe positive feedback pathways.
- A sensor/receptor is required to monitor and limit levels.
- A sensor/receptor is unnecessary to monitor and limit levels.
Step by step
Solved in 2 steps
- 1) As a physiologist, which of the following terms should you immediately associate with negative feedback regulation? Answer choices Constancy Relative constancy Relative constancy in interstitial fluid Relative constancy in intracellular fluid 2) Which of the following is true about physiological set-points? Answer choices They act as the integrating center in a negative feedback arc They represent the internal environment They are determined by the actions of the receptors and integrating centers They are constant They act as the effector in a negative feedback arc 3) What is the general purpose of negative feedback mechanisms? Answer choice a. to maintain a constant internal environment b. To anticipate changes in the environment c. To return a variable to its set-point d. To bring about the rapid change of a variable e. To detect changes in the external environmentDefine homeostasis. What happens when homeostasis fails? List the three basic components of a control system and give an example. Describe the components of a reflex pathway. Contrast the response loop and the feedback loop. Explain the relationship between a regulated physiological variable and its setpoint. Is the physiological variable exactly at its setpoint? Compare and contrast negative and positive feedback. Give a biological example of each. Is the setpoint constant or can it change over time? If setpoints can change over time, what is this called? Chapter 2:Select the statements that correctly describe negative feedback pathways. 1. A sensor/receptor is required to monitor and limit levels. 2. A sensor/receptor is unnecessary to monitor and limit levels. 3. Feedback contributes to homeostasis. 4. Feedback prevents homeostasis. 5. Feedback stimulates the effector to continue to do the same thing. 6. Feedback stops the effector from doing one thing and stimulates it to do the opposite. 7. When the target level for a hormone is reached, feedback results in an increase of that hormone being released. 8. When the target level for a hormone is reached, feedback results in a reduction of that hormone being released. Record your answers in ascending (lowest to highest) order.
- Describe how blood sugar (e.g. glucose plasma concentration) is regulated with the hormones, insulin, and glucagon. For this feedback loop, identify the following components of the feedback loop: stimulus, receptor, control center, efferent pathway, effector, and response. Be comfortable with this feedback loop to be able to describe the effects of changing various components of the feedback loop.Organismal homeostasis depends upon the presence of control systems. Give a physiological example of a negative feedback control system its positive feedback. Clearly describe the role(s) that each of the following elements plays in all control systems: such as controller, effector and receptor.State the effector and sensor of this system. Then choose if it utilizes a feedforward, negative feedback or positive feedback strategy.
- In a negative feedback loop, the effector moves the system in the direction as the stimulus.For the following physiological events, identify the following components of homeostatic control Variable Stimulus Receptor Input Control center Output Effector Response Thyrotropin-releasing hormone (TRH) is a hormone regularly released by the hypothalamus. Once released, it then stimulates the anterior pituitary gland causing it to release thyroid stimulating hormone (TSH). TSH then stimulates the thyroid gland to release the hormones T3 and T4. T3 and T4 have two main effects. First, they increase overall metabolism. Secondly, T3 and T4 can bind to these receptors on the hypothalamus and anterior pituitary, inhibiting the production of TRH and TSH respectively.Which of the following is the correct definition of positive feedback? a The process by which the body neglects homeostasis. b A mechanism in which the body's response to a stimulis opposes the stimulus. c A mechanism whereby the body responds to a stimulus by acting to enhance the stimulus d The dynamic equilibrium maintained by an integrating center which causes an effector to respond to the stimulus received by the receptor.
- Give an example of a feedback mechanism in the human body. Explain your example briefly. Make sure to identify the type of feedback (negative or positive), the receptor, the control center and the effector.Positive feedback loops are used in chemical messaging in the body. Below is a list of steps that describe how a positive feedback system works in chemical messaging. The list is out of order. Placed the list in the proper order. 1. A sensor in a persons finger senses a change in the bloodstream. 2. The chemical messenger triggers the production of a specialized protein in the finger in response to the original signal. 3. A chemical messenger is released from the brain and travels to the finger. 4. As the specialized protein is made in the finger, it triggers the production of even more specialized protein. 5. The brain determines that conditions are no longer in homeostasis.Which of the following is comparable to a negative feedback cycle? opening of voltage-gated Na" channels in response to a depolarizing graded potential movement of K* through leak channels opening of voltage-gated K* channels in response to a depolarizing graded potential operation of the Na -K ATPase at rest opening of voltage-gated Ca- channels in response to an action potential arriving at the axon terminal