In the cardiovascular system, the smallest blood vessels are called which of the following?

• A. Veins
• B. Arteries
• C. Capillaries
• D. Venules

Answer: (C)

Verified step by step guidance

1. Understand the structure of the cardiovascular system, which includes arteries, veins, venules, and capillaries.
2. Recall that arteries carry blood away from the heart and are generally larger vessels.
3. Recognize that veins carry blood back to the heart and are also relatively large compared to the smallest vessels.
4. Identify venules as small vessels that collect blood from capillaries and transport it to veins.
5. Know that capillaries are the smallest blood vessels where the exchange of gases, nutrients, and waste occurs between blood and tissues.