Which of the following blood vessels carries oxygenated blood away from the heart?

1. Analyze the question The question asks which vessel carries oxygenated blood away from the heart. Two things to notice: the direction (away from the heart) and the type of blood (oxygenated).

2. Explain the concept Blood vessels are named by the direction in which they carry blood:

• Arteries carry blood away from the heart to the body's organs. They have thick, muscular, elastic walls to withstand high pressure.
• Veins carry blood towards the heart. They have thinner walls and valves to prevent backflow.
• Capillaries are tiny, thin-walled vessels where exchange of gases, nutrients and wastes happens between blood and tissues. They link arteries to veins.
• Venules are small vessels that collect blood from capillaries and join to form veins, so they carry blood towards the heart.

3. Step-by-step solution

• Away from the heart: this rules out veins (D) and venules (B), which carry blood toward the heart.
• Capillaries (C) do not carry blood over a long distance away from the heart. They are exchange vessels.
• Arteries (A) carry blood away from the heart. Most systemic arteries, such as the aorta, carry oxygenated blood to the body.

4. Answer The correct option is A. Arteries.

A small note for deeper understanding: the pulmonary artery is an exception because it carries deoxygenated blood away from the heart to the lungs. However, among the options given, arteries is clearly the best answer, and the question refers to the general rule (systemic arteries such as the aorta).

5. Exam tip Remember: Arteries = Away from the heart. Also remember that veins are the vessels that "visit" the heart, since they bring blood back to it. If a question mentions the pulmonary vessels, check carefully, because they reverse the usual oxygenation pattern (pulmonary artery is deoxygenated, pulmonary vein is oxygenated).