ANATOMY

Detailed explanation-1: -From the capillaries, blood passes into venules, then into veins to return to the heart. Arteries and arterioles have relatively thick muscular walls because blood pressure in them is high and because they must adjust their diameter to maintain blood pressure and to control blood flow.

Detailed explanation-2: -Answer and Explanation: The correct characteristic of arteries is that they always carry blood away from the heart. Nearly every artery also carries oxygenated blood, but not all.

Detailed explanation-3: -Arteries carry oxygen rich blood from the heart to all parts of the body. Since the heart pumps blood into the arteries the blood flow is always rapid and at high pressure. The arteries have to withstand the high pressure at which heart is pumping blood. Hence they have thick elastic walls.

Detailed explanation-4: -Walls of the arteries are thick because they have to withstand the high pressure released from the heart during the process of pumping the blood. Therefore, the thick walls of the arteries help in maintaining the blood pressure simultaneously by controlling blood flow.

Detailed explanation-5: -Arterioles are tubes with thick walls of muscle that can adjust the amount of space they have inside. This allows them to keep your blood pressure at a certain level and control how much blood flows through your arterioles.