The extrinsic glands associated with the digestive system secrete components that aid in the digestion of foodstuffs in the mouth and intestine. The liver is also involved in the further processing of nutrients for the body. Digestion starts with saliva which is a mucous secretion containing the enzyme amylase.. Describe the flow of saliva from its synthesis to secretion. 4. Identify the glands and bladder associated with the lower digestive system. 5. Describe the organization of the parenchyma in the pancreas and its duct system. 6. Define and characterize the cellular components found in the acini of the pancreas. 7.