When a person is chewing food,the concentration of ions in saliva changes with:
A)A decrease in Na+,Cl-,and HCO3-. B)A decrease in Na+ and Cl- and an increase in HCO3-. C)A decrease in K+ and Na+. D)An increase in Na+,Cl-,and HCO3-. E)A decrease in K+ and HCO3-.
A 50-year-old man complains to his primary care physician about a chronic burning sensation in his chest.The pain is worse when he lies down at night after a large meal,and it can be alleviated to some degree by the use of over-the-counter antacids.The pain experienced by the patient is probably caused by dysfunction of which of the following gastrointestinal structures?
In an experimental study,a researcher transects cranial nerve IX in a dog.In comparison with an animal with an intact cranial nerve IX,which of the following responses to the sight and smell of a meal will be reduced?
A)Pancreatic enzyme secretion B)Relaxation of the sphincter of Oddi C)Gastric acid secretion D)Gastric relaxation E)Salivation