In the gate control theory of pain, ________ open(s) the gate and ________ close(s) the gate.
A) substance P; endorphins
B) endorphins; substance P
C) norepinephrine; epinephrine
D) epinephrine; norepinephrine

Question

Quizplus · Accepted Answer

The gate control theory of pain suggests that pain signals are modulated by a "gate" in the spinal cord. Substance P is involved in opening the gate and increasing pain perception, while endorphins help to close the gate, reducing pain perception.

In the Gate Control Theory of Pain, ________ Open(s) the Gate