Which morpheme means blood vessel?

• A. Angi/o
• B. Hem/o
• C. My/o
• D. Dia-

Answer: (A)

Understanding word parts: identifying the combining form for a body structure. The morpheme that denotes a blood vessel is angi/o. It comes from a Greek root meaning vessel, and it’s the form you attach to suffixes to talk about vessels, especially blood vessels. That’s why you see terms like angiography (imaging of blood vessels), angioplasty (procedure to widen a vessel), and angiogenesis (growth of new blood vessels).

Hem/o means blood, which is used in terms like hematology or hemorrhage—these describe the blood itself or blood-related conditions, not the vessel. My/o refers to muscle, as in myopathy or myocardium. Dia- is a prefix meaning through or across, used in words like diagnosis or diameter, and does not specify a blood vessel. Therefore, angi/o is the best morpheme for blood vessel.