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1. 
The process of breaking food down into nutrients is called...
A.
circulation.
B.
respiration.
C.
digestion.
2. 
The digestive system starts in...
A.
the mouth.
B.
the stomach.
C.
the intestines.
3. 
... is the gas our body needs to live.
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
4. 
The most important organs in the respiratory system are...
A.
the kidneys.
B.
the lungs.
C.
the blood vessels.
5. 
Blood circulates through tubes called...
A.
kidneys.
B.
intestines.
C.
blood vessels.
6. 
The organs in charge of cleaning the blood and making urine are...
A.
the lungs.
B.
the kidneys.
C.
the heart.
7. 
The system in charge of making blood circulate through the body is...
A.
the digestive system.
B.
the circulatory system.
C.
the respiratory system.
8. 
The organ that pumps blood through the blood vessels is...
A.
the heart.
B.
the kidneys.
C.
the lungs.
9. 
The trachea is part of the ... system.
A.
circulatory.
B.
digestive.
C.
respiratory.
10. 
Very thin, fragile blood vessels are called...
A.
veins.
B.
capillaries.
C.
arteries.