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-.