Answer:
a) Increases
Vasoconstriction of veins refers to the narrowing of the blood vessels in the venous system. When veins constrict, it reduces the volume of blood within the venous reservoirs, which are areas where blood can accumulate.
By decreasing the volume of blood in the venous reservoirs, vasoconstriction increases the overall blood volume in the circulatory system. This increased blood volume leads to an increase in blood pressure.
Therefore, vasoconstriction of veins shifts blood from venous reservoirs and causes an increase in blood pressure.