Angle that is smaller than a right angle (less than 90Â°). Angle formed by two lines or two perpendicular planes that measures 90Â°. Symbol denoting that a straight line meets another at a right angle. Symbol denoting that two straight lines do not remain at a constant distance from one other. Symbol denoting that two straight lines remain at a constant distance from one another.
Constriction vs. Dilation. Constriction and dilation are opposite, but related, processes in the body. Whereas dilation is an opening or widening of a structure or passageway to increase material flow, constriction leads to a decrease in material flow by closing the passage.
This is the narrowing of the blood vessels that result from contraction of the vessels muscular walls, particularly the large arteries and the small arterioles.This progression is the exact opposite of vasodilation, which is the widening or opening up of the blood vessels.asoconstriction Treatment. Since vasoconstriction is when blood vessels constrict and decreases the flowing of blood, then treatment for this would include using vasodilators such as alpha adrenoceptor antagonists, or calcium-channel blockers to widen the blood vessels to help with the flow of blood.