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This tables lists some of the opposing effects of the sympathetic and
parasympathetic nervous systems.
| Sympathetic system | Parasympathetic system |
| Increase heart rate | Decrease heart rate |
| Dilate lung airways | Constrict lung airways |
| Decrease digestive system motility | Increase digestive system motility |
| Contract digestive system sphincters | Relax digestive system sphincters |
| Stimulate sweating | Inhibit sweating |
| Reduce saliva volume | Increase saliva volume |
| Increase brain alertness | |
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