In positive feedback, a. the effector produces a response that opposes the initi
ID: 3504680 • Letter: I
Question
In positive feedback,
a. the effector produces a response that opposes the initial stimulus and shuts off when conditions return to the normal range.
b. the effector produces a response that amplifies the response, but does not continue indefinitely.
c. the effector produces a response that increases and reinforces the initial stimulus.
d. the effector produces a response that reverses the initial stimulus.
e. the effector produces a response that does not affect the initial stimulus.
Explanation / Answer
Option a is incorrect as positive feedback as the name suggests promotes the initial stage and increases the action that produced the feedback thus adding to it.
Option d is incorrect as the effector does not reversed the initial stimulus. It is the function of negative feedback.
Option e is incorrect as positive feedback has a positive effect, and not null effect.
Concluding option b and c, in physiological systems, there lie many positive and negative feedbacks. The main difference that lies is the positive feedback is not continuous till infinity. It always stops at a level at which physiological response is achieved.
Hence answer is b.