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1. What is another name for the circulatory system?
A
Digestive system
B
Nervous system
C
Cardiovascular system
2. What are the main parts of the circulatory system?
A
Heart, blood vessels, blood
B
Heart, blood
C
Heart, blood vessels
3. The heart is divided into how many chambers?
A
6
B
4
C
2
4. What is the purpose of valves in the circulatory system?
A
Increase blood pressure
B
Filter impurities
C
Prevent backflow of blood