8. Which is the main organ of circulation?
A. Blood
B. Heart
C. Capillary
D. Blood vessels
9. How do arteries differ from veins?
A. Arteries
carry
blood.
B. Arteries are thin-walled and are used for gas exchange.
C. Arteries have thicker wall layers to accommodate the changes in
pressure from the heart.
D. Arteries have thinner wall layers and valves and move blood by the
action of skeletal muscle.
10. Which blood vessel carries blood from all parts of the body to the heart?
A. Aorta
B. Vena cava
C. Pulmonary vein
D. Pulmonary artery
11. What type of circulation is responsible for removing oxygen-depleted blood
cells from the heart going to the lungs to receive proper amount of oxygen?
A. Open circulation
B. Coronary circulation
C. Systemic circulation
D. Pulmonary.circulation
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