The right answer is D.
The sympathetic nervous system is one of the three components of the autonomic nervous system, managing the activity of visceral organs and the automatic functions of the body, such as breathing or beating of the heart. The sympathetic nervous system is involved in many unconscious physiological activities through two neuromodulators of the catecholamine family: adrenaline, but especially norepinephrine.
At the level of the sympathetic nervous system:
* A pre-ganglionary neuron innervates approximately twenty ganglionic neurons
* A ganglionic neuron innervates several effectors (multiple organs)
This difference in axon branching explains in part the differences in the extent of the effects of sympathetic and parasympathetic systems.
