Final answer:
Sympathetic dominance of venous pressure involves vasoconstriction of the veins, which increases blood pressure and enhances blood flow back to the heart.
Step-by-step explanation:
During sympathetic dominance of venous pressure, the sympathetic nervous system stimulates vasoconstriction of the veins. This causes the veins to constrict, increasing the pressure on the blood within them and speeding up the return of blood to the heart. Venoconstriction is important in redistributing blood flow and maintaining blood pressure.