Multiple Choice
Which statement best describes the central principle of physiology related to homeostasis?
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1. Introduction to Anatomy & Physiology
Homeostasis
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Which of the following is an example of a positive feedback mechanism?
A
the control of blood sugar by insulin
B
blood clotting
C
the control of blood pressure
D
the regulation of body temperature
Verified step by step guidance1
Understand the concept of feedback mechanisms: Feedback mechanisms are processes that use the conditions of one component to regulate the function of the other. They are crucial for maintaining homeostasis in the body.
Differentiate between positive and negative feedback: Negative feedback mechanisms work to reduce the output or activity of any organ or system back to its normal range of functioning, while positive feedback mechanisms enhance or amplify changes; this tends to move a system away from its equilibrium state and make it more unstable.
Identify examples of negative feedback: The control of blood sugar by insulin, the control of blood pressure, and the regulation of body temperature are all examples of negative feedback mechanisms. They work to maintain homeostasis by counteracting changes in the body.
Identify examples of positive feedback: Positive feedback mechanisms are less common but include processes like blood clotting and childbirth. In blood clotting, once a vessel is damaged, platelets start to cling to the injured site and release chemicals that attract more platelets, rapidly forming a clot.
Conclude with the correct example: Based on the understanding of feedback mechanisms, blood clotting is an example of a positive feedback mechanism because it amplifies the response to a stimulus (injury) to achieve a specific outcome (clot formation).
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