Question

Which blood vessels have the smallest diameter?

A. Capillaries

B. Arterioles

C. Venules

D. Lymphatic

Answer 1

The smallest of the arteries eventually branch into arterioles. They, in turn, branch into a extremely large number of the smallest diameter vessels—the capillaries (with an estimated 10 billion in the average human body).

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Answer 2

→Question: Which blood vessels have the smallest diameter?

↔Options:

• A. Capillaries
• B. Arterioles  
• C. Venules
• D. Lymphatic

→Answer:

• A.  Capillaries

• They are the blood vessels with smallest diameter,
• 3 to 4 micrometers in diameter,
• They carry blood away from the heart and the vessels that return blood to the heart.