How can the sympathetic axons stimulate so many effectororgans simultaneously?
How can the sympathetic axons stimulate so many effector
organs simultaneously?
The nervous system is made up of the central nervous system and the peripheral nervous system: The brain and the spinal cord constitute the central nervous system. The nerves that branch out from the brain and spinal cord to the rest of the body make up the peripheral nervous system that is further subdivided into somatic nervous system (voluntary control) and autonomic nervous system (involuntary control). The autonomous nervous system can be further divided into sympathetic and parasympathetic divisions.
The sympathetic division is often called the fight-or-flight division of the Autonomic nervous system. Sympathetic division tends to have an excitatory effect on effectors. Sympathetic activities result in increased alertness and metabolic activities in order to prepare the body for an emergency situation. The sympathetic division activates the body to 'fight or flight largely through the release of norepinephrine from post ganglionic fibers and the secretion of epinephrine, norepinephrine and dopamine from the adrenal medulla.
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