Which one of the following are the main functions of renin and angiotensin II:
a. blood pressure rises; this causes vasoconstriction and further increases blood pressure
b. blood pressure rises; this causes vasoconstriction and a decrease in blood pressure
c. blood pressure rises; this causes vasodilation and a decrease in blood pressure
d. blood pressure falls; this causes vasodilation and an increase in blood pressure
e. blood pressure falls; this causes vasoconstriction and an increase in blood pressure.