Final answer:
All the root terms listed—angi/o, arteri/o, vas/o, and vascul/o—refer to vessels. Each root word is related to vessels, arteries, or the vascular system in medical terminology.
Step-by-step explanation:
The question is asking which of the provided root words does not refer to vessels. The correct answer to the multiple-choice question is E. All of these refer to vessels. Let's look at each root word:
angi/o: Refers to vessels, often used in the context of blood or lymph vessels.
arteri/o: Specifically refers to arteries, which are blood vessels that carry blood away from the heart.
vas/o: This is a general term for vessels.
vascul/o: Pertains to the vascular system, which includes all of the vessels in the body.
Therefore, each term listed: angi/o, arteri/o, vas/o, and vascul/o, is indeed a root word used in medical terminology to refer to different types of vessels.