question_answer 40)

    The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one (a) Pepsin                            (b) Mucus                           (c) Salivary amylase         (d) Bile

Answer:

                  (b) The mucus is secreted in the gastric juice by the glands present in the stomach wall. It helps to protect the wall of stomach from its own secretions of hydrochloric acid. If mucus is not secreted, HCI will cause the erosion of inner lining of stomach leading to ulcer formation. Pepsin acts on proteins in the stomach. Salivary amylase is present in saliva, it acts on starch in the mouth. Bile helps in emulsification of fat in small intestine.