When blood vessels are constricted, what effect does it have on blood pressure?

When blood vessels are constricted, the diameter of the vessels decreases, leading to an increase in resistance to blood flow. According to the principles of hemodynamics, blood pressure is directly influenced by the volume of blood in the system and the resistance to flow. When resistance increases due to vasoconstriction, the heart has to exert more force to push the blood through the narrower vessels. This heightened effort results in an increase in blood pressure. Consequently, the correct answer reflects that constricted blood vessels lead to a rise in blood pressure due to the increased vascular resistance and the compensatory mechanisms of the cardiovascular system.