Which of the following features is not a characteristic of arteries? Arteries

Analyze the question: We are asked to find the feature that is NOT a characteristic of arteries.

Concept: Arteries carry blood away from the heart under high pressure. Because of this, they are built differently from veins.

Checking each option:

• A. Possess valves at intervals throughout their length. This is false for arteries. Valves are a feature of veins, where they stop backflow because blood pressure is low. Arteries have high pressure from the heart's pumping, so they do not need valves. The only valves associated with arteries are the semilunar valves at the base of the aorta and pulmonary artery, right where they leave the heart, and not throughout their length.
• B. Have thick muscular and elastic walls. This is true. The thick walls withstand high pressure and help maintain blood flow through elastic recoil.
• C. Carry blood away from the heart. This is true. It is the defining function of arteries.
• D. Transport oxygenated blood with the exception of the pulmonary artery. This is true. Most arteries carry oxygenated blood (e.g. the aorta), but the pulmonary artery carries deoxygenated blood to the lungs.

Answer: The feature that is not a characteristic of arteries is A.

Exam tip: Remember "Veins have Valves." If an option gives valves along the length of a vessel, think veins. Also remember that arteries are Away from the heart.