Effect of parasympathetic stimulation on saliva production is
Causes high volume, thick viscous secretion
Causes small volume, watery secretion
Causes high volume, watery secretion
Causes small volume, thick viscous secretion
Regulation of saliva production :

Parasympathetic ⇒ High volume, watery enzyme rich secretion.
Sympathetic ⇒ small volume,.thick viscous mucus  secretion.