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The way in which the velocity of an airplane is controlled can be thought of as an analogy for a negative-feedback control system in an organism.Suppose an airline pilot sets an aircraft's engines to produce a velocity of 450 mph,and measures that speed using an instrument on the outside of the plane.When another pilot reports turbulence ahead,the first pilot uses the throttle to change the velocity set point to 350 mph.
-According to this analogy,the throttle is
A) the control mechanism.
B) destabilizing.
C) initiating positive feedback.
D) an effector.
E) the controlled variable.

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Quizplus · Accepted Answer

In this analogy, the throttle plays the role of the effector, which is the component that carries out the action to achieve the desired output of the system. The control mechanism would be the pilot's decision to change the velocity set point, and the instrument that measures the speed would be the sensor. The throttle is not destabilizing or initiating positive feedback, and it is not the controlled variable (which in this case is the airplane's velocity).

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