Vasoconstriction and Vasodilation Occur Due to Sympathetic Activation of Which

Question

Vasoconstriction and vasodilation occur due to sympathetic activation of which vessel layer?
A) endothelium
B) intima
C) media
D) epithelium
E) adventitia

Accepted Answer

The media layer of blood vessels contains smooth muscle cells, which are controlled by the sympathetic nervous system. Sympathetic activation can cause vasoconstriction or vasodilation by stimulating or inhibiting the contraction of smooth muscle cells in the media layer.