The CNS (Central Nervous System) is defined as:
? A specialized structure at the beginning of a sensory neuron that receives the
stimulus.
? The sensory neuron that relays sensory information from the receptor into the brain
or spinal cord.
? A center in the brain or spinal cord where information is relayed across one or more
synapses from the sensory neuron to the motor neuron.
? The motor neuron that transmits information out of the brain or spinal cord to an
effector.
? A smooth muscle cell, cardiac muscle cell, pacemaker system cell, secretory cell, or
skeletal muscle cell that provides the reflex or reaction response.
