Atrium Ventricle Veins Arteries

In the walls of the heart, there are two thin layers that form a sandwich around a thick layer of muscle called the

• epithelial tissue.

• pericardium.

• connective tissue.

• myocardium.

Which is the correct flow of blood?

• R. atrium --> R. Ventricle --> pulmonary artery

• R. atrium --> L. atrium --> aorta

• L. ventricle --> pulmonary artery --> aorta

• L. ventricle --> L. atrium --> aorta

Which of the following are the smallest blood vessels?

• artery

• vein

• venule

• capillary

The function of valves in the human circulatory system is to

• stimulate the heart beat.

• accelerate the flow of blood.

• prevent the backward flow of blood.

• serve as a cushion to prevent friction

Which type of blood vessel is both strong and elastic?

• capillary

• artery

• vein

If a blood vessel has valves, it is probably a(n)

• vein.

• artery.

• capillary

Blood vessels that carry blood away from the heart are called

• veins.

• arteries.

• capillaries.

Coronary artery

• H

• J

• F

• E

Aorta

• 1

• 2

• 4

• 5

Left ventricle

• 1

• 2

• 3

• 4