Which of the following hypotheses would address the question of why salivary amylase and lingual lipase do not work in the stomach?
a) Salivary amylase and lingual lipase are synthesized by the submandibular salivary glands and therefore do not work outside of the oral cavity.
b) Salivary amylase and lingual lipase do not work below a pH of 4.5
c) The epithelial cells of the stomach secrete an acidic mucus that breaks the enzymes down.
d) The gastric lining is permeable to water. Therefore the water-soluble enzymes diffuse out of the stomach following the concentration gradient.
