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Unformatted text preview: than turning it completely on or off. Some examples of these reflex arcs are the regulation of blood pressure and body temperature . Note that in both of these examples, without ANS input BP and body temperature are "present" and the ANS only alters it. Parasympathetic NS In contrast, the origin of preganglionic neurons in the parasympathetic nervous system is in the brainstem and the sacral region of the spinal cord and it is referred to as craniosacral. Another major difference from the sympathetic nervous system is that the ganglia of the parasympathetic nervous system are located very close to the target organs. These terminal ganglia then extend very short axons to the target. The figure below illustrates this connection as it relates to the control of BP....
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