A. True Vagal stimulation increases acid and pepsinogen secretion; this action is mediated by acetylcholine and gastrin-releasing peptide released from the vagal nerve endings.
B. False After vagotomy, food must enter the stomach to stimulate gastric secretions.
C. True Salivary enzymes are not effective at the low pH of gastric juice.
D. False But mucosal cells are protected by a coat of mucus impregnated with bicarbonate.
E. True This is normally prevented by the cardiac sphincter.