Question

exam lesson name: introduction to human anatomy and physiology
exam number 700794rr
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exam instructions
question 10 of 20 :
select the best answer for the question

1. positive feedback mechanisms are useful for which of the following situations?

○ a. modulating a stimulus to stay within a defined range
○ b. modulating a stimulus to move toward an endpoint
○ c. amplifying a stimulus to stay within a defined range
○ d. amplifying a stimulus to move toward an endpoint
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Explanation:

To solve this, we recall the concept of positive feedback in physiology. Positive feedback amplifies a stimulus to move toward an endpoint (e.g., blood clotting, childbirth). Negative feedback modulates to stay within a range. So we analyze each option:

• Option A: Modulating to stay in range is negative feedback, not positive. Eliminate.
• Option B: Same as A, modulating (negative feedback) to stay in range. Eliminate.
• Option C: Amplifying to stay in range is contradictory (amplifying would move away from range). Eliminate.
• Option D: Amplifying a stimulus to move toward an endpoint matches positive feedback's function.

Answer:

D. Amplifying a stimulus to move toward an endpoint