According to Wikipedia
mucins (Proteins that form mucus) obtain viscoelastic properties by the Exchange of sodium and Calcium Ions. What is Happening after the secretion of mucins; how does These Ions modify the properties of mucins? Which physical effects are important that the mucins "expand 600 fold"?
I would greatly appreciate it, if someone would explain the "Expansion" (and the Change of viscoelastic properties) of mucins due to Ca/Na-Ions and what molecular mechanisms are important for this; I know already what viscoelasticity is.