The
answer is D. So as to take the shortest time to react to stimuli, most sensory neurons
are looped through the spinal cord to motor neurons. Following a reflex action,
the signal is later passed to the brain, from the spinal cord, for the signal
to be analyzed. A reflex arc is divided into
somatic and autonomic reflex arcs. The former is connected to outer muscles
while the later to inner organs.
