Positive feedback differs from negative feedback in that
A)positive feedback benefits the organism, whereas negative feedback is detrimental.
B)the positive feedback's effector responses are in the same direction as the initiating stimulus rather than opposite to it.
C)the effector's response increases some parameter (such as body temperature), whereas in negative feedback it can only decrease the parameter.
D)positive feedback systems have only effectors, whereas negative feedback systems have only receptors.
E)positive feedback systems have control centres that are lacking in negative feedback systems.

Question

Quizplus · Accepted Answer

Positive feedback magnifies or reinforces the stimulus rather than counteracting it, as is the case in negative feedback. This causes the effector's response to be in the same direction as the initiating stimulus. However, it is not necessarily true that positive feedback benefits the organism or that it can only increase some parameter, as there are instances where positive feedback can have harmful effects or decrease parameters (e.g. during uterine contractions in childbirth). The other choices (A, C, D, and E) are incorrect statements.

Positive Feedback Differs from Negative Feedback in That