Flood Stage. 1  The term stage refers to the height of a river (or any other body of water) above a locally defined elevation. This locally defined elevation is a reference level, often referred to as datum. 2  When the discharge of a river increases, the channel may become completely full.
vasoconstrictor (vÄÂ´zÅkÉnstrikÂ´tur) , n (vasopressor), an agent that causes a rise in blood pressure by constricting the blood vessels. In local areas, it causes constriction of the arterioles and capillaries. Vasoconstrictor agents. 2  vasoconstrictor center. 3  vasoconstrictor center. 4  vasoconstrictor center. 5  vasoconstrictor center. 6  vasoconstrictor fibers. 7  vasoconstrictor fibers. 8  vasoconstrictor fibers. 9  vasoconstrictor nerve. 10  vasoconstrictor nerve.
Vasoconstriction is necessary to increase blood pressure and regulate the flow of blood to the muscles. But vasodilation is necessary for the body to carry away toxins and waste from muscles as the exercise progresses. The vasodilation response also helps regulate blood pressure and keep it from going too high.