 Broadly speaking , the effect of norepinephrine on each target organ is to modify its state in a way that makes it more conducive to active body movement , often at a cost of increased energy use and increased wear and tear . This can be contrasted with the acetylcholine @-@ mediated effects of the parasympathetic nervous system , which modifies most of the same organs into a state more conducive to rest , recovery , and digestion of food , and usually less costly in terms of energy expenditure . 
