| Too much sympathetic nervous system activity can be associated with stress, anxiety, and dysphoric mood. |
| The sympathetic nervous system, not white blood cells, is critically important in the regulation of energy expenditure and thermogenesis. |
| Drugs can modulate the activity of the sympathetic nervous system by affecting the synthesis, storage, release or reuptake of noradrenaline. |
| Those who are sensitive, nervous and anxious, with a reserved nature, are prone. |
| Some may be anxious and nervous or may develop behaviors to avoid stimuli that remind them of past experiences. |
| Without a studio audience to warm things up, Vaughan's attempts to jolly things along fall flat to the sounds of nervous giggles from the crew. |
