The chemical digestion of food is dependent on a whole range of hydrolase enzymes produced mostly by the cells lining the gut as well as other associated organs such as the pancreas, salivary glands, stomach, liver and small intestine. the end goal is to break large food molecules into very much smaller building block units or monomers. these can then be readily absorbed through the into the bloodstream for transport to the liver and from there to other parts of the body. enzymes are both ph and temperature specific. seen here are the reaction rates of three common digestive enzymes. based on the data, which enzyme(s) require(s) the addition of hcl for optimum activity?