Blood Vessels and the Heart

What is the purpose of the valves located in veins?

• To keep the vein open for blood to flow through

• To keep blood flowing in one direction through the vein

• To allow blood to flow in both directions within the vein

• To allow the blood to flow back down to the lower parts of the body

The job of the capillaries is to assist in the exchange of only gases such as carbon dioxide and oxygen between the blood and the body tissues.

• True

• False

A difference between veins and arteries is that veins have narrow lumens and arteries have wide lumens

• True

• False

I have muscular walls, and a small lumen.  Pump blood away from the heart

• Artery

• Vein

• Capillary

• Arteriole

Which of these blood vessels have small lumens? (Two answers)

• Artery

• Vein

• Capillary

What is the function of capillaries?

• Transports deoxygenated blood

• Transport oxygenated blood

• Site for exchange of materials

What is the function of veins?

• Transport deoxygenated blood

• Transport oxygenated blood

• Site for exchange of materials

What are present in veins but absent in arteries?

• smooth elastic tissues

• muscular tissues

• valves

How are capillaries adapted for their function?

• Have partially permeable walls

• One-cell thick endothelium

• Presence of valves

• Large lumen

I have a large lumen, I have thin muscular walls, I pump blood towards the heart

• Artery

• Vein

• Capillary

• Arteriole