8. Which of the following explains best the function of the capillaries? a. It carries blood to the heart. b. It carries blood away from the heart. c. It pumps blood to the different parts of the body, d. Exchange of materials takes place between the cells and the blood.

9. Why heart is divided into left and right chambers? a. To avoid backflow of the blood. b. Right chambers receive and pump deoxygenated blood while left chambers receive and pump oxygenated blood. c. Right chambers receive and pump oxygenated blood while left chambers receive and pump deoxygenated blood. d. All of the above

10. Which of the following best describes a valve? a. It receives and holds the blood b. It pumps blood to the lungs and to the different parts of the body. c. Keeps the blood moving in one direction only. d. It is where exchange of gases takes place.

11. What happens to the diaphragm when you breathe in or inhale? a. contracts and moves upward c. contracts and moves downward b. relaxes and moves upward d. relaxes and moves downward

12. Why circulatory system is a two-way system? a. It has arteries and veins which delivers blood the heart. b. It has heart which pumps blood and blood vessels which carries the blood. c. One part of the system pumps blood to the lungs and another part of the system pumps blood to the body. d. None of the above

13. What happens to the chest cavity when you breathe out or exhale? a. The chest cavity expands and there is now less space and more air pressure inside the lungs. b. The chest cavity expands and there is now more space and less air pressure inside the lungs c. The chest cavity returns to its original size and there is now less space and more air pressure inside the lungs. d. The chest cavity returns to its original size and there is now more space and less air pressure inside the lungs.​