The process which hollow visceral organs undergo to propel substances is called _

The movement is called as peristalsis. This leads to the forward movements, which leads to pushing the food into the stomach and intestines, fro the esophagus, for digestion. It is a mechanical movement. These are the series of wave-like muscle contractions. 

Ribonuclease activity is a type of nuclease that catalyzes the degradation of rna into small components.