Increased blood flow within an artery is the result of smooth muscle A relaxation causing vasodilation B contraction causing vasodilation C relaxation causing vasoconstriction D contraction causing vasoconstriction. - Scottish Highers Human Biology - Question 16 - 2019

Increased blood flow within an artery primarily occurs due to the relaxation of smooth muscle, which leads to vasodilation. During vasodilation, the lumen of the artery widens, allowing for greater blood volume to flow through. This process is critical in various physiological responses, determining how blood is distributed throughout the body based on activity levels and needs.