Blood vessels

Which of the following is the smallest blood vessel?

• Venules

• Arterioles

• Veins

• Capillaries

These carry blood away from the heart

• arteries
• veins
• venules
• capillaries

These carry blood to the heart:

• arteries
• veins
• capillaries
• arterioles

These have valves that prevent backflow of blood

• arteries
• veins
• arterioles
• capillaries

Where material exchange takes place between the cells and blood vessels:

• arteries
• veins
• venules
• capillaries

Largest artery in the human body:

• Pulmonary artery
• femoral artery
• aorta
• carotid artery

Contract and expand with the heart beat:

• arteries
• veins
• venules
• capillaries

Carry oxygenated blood back to the heart, only type of these to do this:

• pulmonary arteries
• pulmonary veins
• pulmonary capillaries
• aorta artery

Carry blood away from heart; mostly oxygen-rich

• Arteries
• Veins
• Capillaries

Thin-walled vessels that allow for the exchange of O_{2 ,} CO₂, nutrients and wastes between blood cells or air sacs in the lungs

• Arteries
• Veins
• Capillaries