The heart-lung machine is used so that surgeons can operate on the arteries supplyingheart muscle. These arteries may be diseased. Name these arteries and explain how they may become diseased. name of arteries 3Explanat

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.