Multiple Choice
Which of the following is an example of positive feedback?
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7. Energy and Metabolism
Negative & Positive Feedback
Multiple Choice
Which of the following correctly describes how positive and negative feedback are different?
A
Positive feedback always results in a return to equilibrium, while negative feedback never does.
B
Negative feedback only occurs in plants, while positive feedback only occurs in animals.
C
Positive feedback maintains homeostasis, while negative feedback disrupts it.
D
Negative feedback reduces deviations from a set point, while positive feedback amplifies changes away from a set point.
Verified step by step guidance1
Step 1: Begin by understanding the concept of feedback mechanisms in biology. Feedback mechanisms are processes that help regulate biological systems to maintain stability or respond to changes.
Step 2: Define negative feedback. Negative feedback is a regulatory mechanism where a change in a system triggers a response that counteracts or reduces the deviation from a set point, helping to maintain homeostasis. For example, body temperature regulation is controlled by negative feedback.
Step 3: Define positive feedback. Positive feedback is a mechanism where a change in a system triggers a response that amplifies or increases the deviation from a set point. This is typically used in processes that need to be pushed to completion, such as childbirth (oxytocin release during labor).
Step 4: Compare the two mechanisms. Negative feedback works to stabilize a system and maintain equilibrium, while positive feedback drives a system further away from equilibrium to achieve a specific outcome.
Step 5: Analyze the given options. The correct description is: 'Negative feedback reduces deviations from a set point, while positive feedback amplifies changes away from a set point.' This aligns with the definitions and functions of these feedback mechanisms.
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