Catalysts are not permanently affected by the reaction.
Enzymes act as organic catalysts.
All physiological function intimately linked to enzymes. No crossing of boundaries, ie. If stomach contents not neutralized, amylase activity would be slow therefore incomplete starch digestion. Mouth S. Amylase Pig, man Glycogen, starch, dextrin Mucin All Lubrication Pregast. Intrinsic factor All Vit.