What is the difference in structure between the sympathetic and parasympathetic nervous system?
The sympathetic’ nervous system is a set of nerves that activate what has been called the “fight-or-flight” response that prepares the body for action. The parasympathetic nervous system instead prepares the body to rest and conserve energy. ie.parasympathetic ,When a stimulus arises in an organ, such as a bright light shone into the eyes, the message is conducted through sensory fibres to the midbrain to give rise to an appropriate stimulus that travels through the parasympathetic fibers of the oculomotor (third cranial) nerves to the pupils, resulting in automatic contraction of the pupillary muscles to constrict the aperture and so reduce the amount of light reaching the sensory cells in the retinae of the eyes. Sympathetic.. The sympathetic nervous system is even more automatic and only exceptionally susceptible to any voluntary control. When the environmental temperature is raised on a hot summers day, the increased temperature initiates several automatic responses. Thermal recept
