Answer :
Answer:
The correct answer is- tunica media
Explanation:
Tunica media is a thicker arterial wall layer which is mostly made up of smooth muscle cells. It forms the middle layer in blood vessels. Due to having a large amount of smooth muscle cells, these arterioles play an important role in regulating the flow of blood between arteries and capillaries.
They regulate blood flow by constricting and dilating the blood vessels. This regulation is important for the efficient transport of gases and nutrients when reaches the capillary bed. So the correct answer is tunica media.