Which of the Following Statements Are True of the Stomach

Which of the following statements are true of the stomach (Select all that apply) ?

A) Parietal cells secrete hydrochloric acid and the intrinsic factor.
B) The hormone gastrin decreases gastric motility.
C) Pepsin begins the chemical digestion of proteins.
D) The external muscle layer has only the typical circular and longitudinal layers.
E) The pyloric sphincter prevents backup of stomach contents into the esophagus.
F) Parasympathetic impulses carried by the vagus nerves increase the motility of the stomach.