Which statement best describes arteries?

• A. They carry blood away from the heart
• B. They carry blood toward the heart
• C. They are the smallest blood vessels
• D. They connect muscles to bones

Answer: (A)

Arteries carry blood away from the heart. This is how the heart pumps blood into the body, pushing it through thick, elastic walls that can withstand the high pressure of each heartbeat. Most of the blood in arteries is oxygen-rich, traveling from the heart to tissues, delivering oxygen and nutrients. An important nuance is that the pulmonary artery is an exception, carrying deoxygenated blood from the heart to the lungs. This distinguishes arteries from veins, which return blood toward the heart, and from capillaries, the tiny vessels where exchange with tissues occurs. The other options describe veins, capillaries, or tendons, so the statement about carrying blood away from the heart best describes arteries.