The Gate-Control Theory of Pain Suggests That

The gate-control theory of pain suggests that

A) the pain signals must pass through a kind of "gate" located in the spinal cord.
B) the skin receptors act as a gate for the pain sensation.
C) the cortex blocks pain unless released by substance P.
D) the gate is a physical structure that blocks pain signals.
E) there are mechanisms at each level of the brain that can selectively block pain messages.