Circulatory System Quiz

What are blood vessels?

• Containers that hold blood

• Plumbing system for the body

• Active organs that deliver oxygen and nutrients to cells

• Passive tubes that carry liquid around the body

Which type of blood vessel carries blood away from the heart?

• Arteries

• Veins

• Capillaries

• Venules

What is the function of arterioles?

• To carry blood back to the heart

• To branch out into capillaries

• To carry away waste products

• To deliver oxygen and nutrients to cells

How long would all the blood vessels in your body stretch if they were strung together?

• 10,000 kilometers

• 100,000 kilometers

• 50,000 kilometers

• 200,000 kilometers

What is the innermost layer of blood vessels called?

• Lumen

• Tunica intima

• Tunica media

• Tunica externa

Which layer of blood vessels contains smooth muscle cells and elastin?

• Tunica intima

• Tunica media

• Tunica externa

• Lumen

What is the function of capillaries?

• To act as a transfer station between arteries and veins

• To carry blood away from the heart

• To bring blood back to the heart

• To deliver oxygen and nutrients to cells

What is the purpose of venous valves in veins?

• To regulate blood pressure

• To prevent backflow of blood

• To expand and contract the lumen

• To deliver oxygen and nutrients to cells

What happens to blood flow in capillaries when the smooth muscle sphincters tighten?

• Blood flow increases

• Blood flow decreases

• Blood flow remains the same

• Blood flow reverses

How long does it take for all the blood in your body to complete a circuit?

• 1 minute

• 5 minutes

• 30 minutes

• 1 hour