Question

Is it true that veins are not capable of vasoconstriction and dilation. ​

Answer 1

Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, in particular the large arteries and small arterioles. The process is the opposite of vasodilation, the widening of blood vessels. The process is particularly important in staunching hemorrhage and acute blood loss. When blood vessels constrict, the flow of blood is restricted or decreased, thus retaining body heat or increasing vascular resistance. This makes the skin turn paler because less blood reaches the surface, reducing the radiation of heat. On a larger level, vasoconstriction is one mechanism by which the body regulates and maintains mean arterial pressure.


that is not true that veins are capable not of vasoconstriction and dilation

Answer 2

When the body needs to mobilize more blood for physical activity, the sympathetic nervous system induces vasoconstriction of veins. The result is an increase in circulating blood volume. This changes cardiac output and arterial blood pressure (CV Physiology: Blood Volume).

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