Which root means 'artery'?

• A. Arthr(o)
• B. Asth
• C. Arterio
• D. Aud

Answer: (C)

The main idea here is recognizing medical roots that name body parts. Arterio- is the combining form that means artery. This is why it appears in terms like arterial, arteriole, and arteriosclerosis—all related to arteries. It’s a way to signal the blood vessels that carry blood away from the heart.

Other roots point to different structures: arthr- refers to joints, not vessels, so it would show up in words about joints or joint disease. Aud- relates to hearing or the ear, not the arteries. The remaining root doesn’t describe arteries either, so it wouldn’t be used to denote arterial meaning.

So, arterio- is the root that designates arteries.