WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 21, Problem 6MC
Summary Introduction
Introduction:
Negative feedback loops bring the internal environment back to normal.
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In a negative feedback loop, the effector produces changes that are a. in the same direction as the change produced by the initial stimulus. b. opposite in direction to the change produced by the initial stimulus. c. unrelated to the initial stimulus.
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.
. A self-amplifying chain of physiologicalevents is calleda. positive feedback.b. negative feedback.c. dynamic constancy.d. homeostasis.e. metabolism.
Chapter 21 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
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- 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.arrow_forwardDefine 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:arrow_forwardgive two examples of feedback mechanisms in the human body. identify the type of feedback (negative or positive), the receptor, the control center and effector.arrow_forward
- . A defective control center (a homeostatic control mechanism component) can lead to: undetermined variable set point inappropriate response to stimuli incorrect analysis of input from effector a and b a, b, and carrow_forwardYou have to identify the following:1. The negative feedback condition/mechanism2. The four components of a negative feedbackloop:A. stimulusB. sensorC. control centerD. effector3. Explain what would happen to eachcomponent if a secretion became too great.arrow_forwardSelect the statements that correctly describe positive 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 prevents homeostasis. 4. Feedback contributes to 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 a reduction of that hormone being released. 8. When a target level for a hormone is reached, feedback results in an increase of that hormone being released. Record your answers in ascending (lowest to highest) order.arrow_forward
- 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.arrow_forwardWhen you step outside in the cold, your body temperature decreases; which causes shivering or contractions of your muscles. In this example, the shivering or contracting of the muscles, is what part of the feedback loop?arrow_forwardDescribe 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.arrow_forward
- 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.arrow_forwardExplain how homeostasis is maintained (use the term feedback loop, stimulus, response, effector, sensor, control center and set point )arrow_forwardPositive 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.arrow_forward
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