| Opposing tonically active endogenous opioid systems modulate the mesolimbic dopaminergic pathway. |
| The EDL is adapted for relatively infrequent bursts of phasic activity, whereas the soleus is tonically activated to maintain posture. |
| Spontaneous glutamate release is independent of calcium influx and tonically activated by the calcium-sensing receptor. |
| The lower esophageal sphincter is tonically contracted at rest to seal the lumen in a rosette at the esophagogastric junction. |
| The influence of hypercapnia on tonically discharging motor units is certainly of interest, and future studies are needed. |
| It is too proud, too austere, too true, and too tonically cruel to appeal to mandarins. |
