<prompt> True about gastric juice secretion is?70 in cephalic phase20 in cephalic phaseCephalic influences are mainly localVagal stimulation decreases gastric secretion in cephalic phase  <response>: ANSWER: B 20 in cephalic phaseREF: Ganong s 22nd ed p. 484 , Guytons 11th ed p. 834-845Phases of gastric acid secretion:Cephalic phase: Accounts for 20 of secretion and occurs when food is not even in mouth, stimulated by sight or smell of food. The impulses originate in cortex and reach the glands my dorsal motor nuclei and then through vagus nervesGastric phase: Occurs by vago gastric reflexes, enter entero reflexes and by gastrin. It accounts for around 70 1500 mlof secretion and occurs when food reaches stomachIII, Intestinal phase: remaining 10 is produced when food is especially in duodenum. It is caused by reflex feed backs. 