Question

Vasoconstriction is to a decrease in blood vessel diameter, as __________ is to an increase in blood vessel diameter.

Answer 1

Answer :

vasoconstriction is to a decrease in blood vessel diameter, as vasodialation is to an increase in blood vessel diameter.

Vasodilation is the widening of blood vessels.It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins, large arteries, and smaller arterioles. The process is the opposite of vasoconstriction, which is the narrowing of blood vessels.

When blood vessels dilate, the flow of blood is increased due to a decrease in vascular resistance and increase in cardiac output. Therefore, dilation of arterial blood vessels mainly the arterioles decreases blood pressure. The response may be intrinsic (due to local processes in the surrounding tissue) or extrinsic (due to hormones or the nervous system). In addition, the response may be localized to a specific organ (depending on the metabolic needs of a particular tissue, as during strenuous exercise), or it may be systemic (seen throughout the entire systemic circulation).