Which of the following lists the correct blood vessel types?

• A. Veins, capillaries, artery
• B. Nerves, vessels, lymph
• C. Arteries only
• D. Capillaries only

Answer: (A)

Blood vessels come in three main types: arteries, veins, and capillaries. Arteries carry blood away from the heart, usually away from the heart to the tissues; veins return blood back toward the heart; capillaries are tiny, thin-walled vessels where the exchange of oxygen, carbon dioxide, and nutrients occurs between blood and tissues. A complete list of blood vessel types must include all three, so this option is correct. The other choices mix in structures that aren’t blood vessels, like nerves or lymph, or give incomplete sets (only arteries or only capillaries), which is why they aren’t correct.