CIRCULATORY SYSTEM

1. What is the circulatory system?
A. The body's breathing system
B. Body's food-processing system
C. The body's blood-transporting system
The body's blood-transporting system
2. Why is oxygen important to blood and to the cells?
A. Oxygen helps the blood to clot
B. Oxygen brings food to the cells
C. Oxygen is necessary for cell growth and energy.
D. Oxygen is not important -- carbon dioxide is the most important substance to the body
3. Which type of blood vessels carries blood away from the heart?
A. veins
B. arteries
C. capillaries
D. All of the above
4. What is the organ that pumps blood all throughout the human body?
A. lungs
B. kidney
C. heart
D. diapragm
5. Why do we have blood in our body?
A. To control our body temperature
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