IBBio 6.1-6.6

Which part of the blood is responsible for forming blood clots?

• Erythrocytes
• Leukocytes
• Platelets
• Plasma

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

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

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

The ________ is composed of circularly arranged layers of smooth muscle cells

• tunica interna
• tunica media
• tunica externa
• none of the above

In arteries, the thickest layer of the wall is the

• tunica interna
• tunica externa
• tunica media
• vasa vasorum

• B = tunica interna

• B = tunica media

• B = tunica externa

• B = lumen

• A = artery

  B = vein

• A = artery

  B = capilary

• A = vein

  B = capillary

• A = capillary

  B = vein

Capillaries are....

• up to 10 µm wide

• up to 18 mm wide

• up to 30 mm wide

• up to 5 nm wide