★ Nervous System Quiz
What percentage of the calories you take in each day are consumed by your brain?
A. 10%
B. 15%
C. 20%
D. 25%
E. 50%
Select your answer:

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Heart Anatomy › ViewWhat chamber pumps blood to the body?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Human Circulatory System › View
__________are structures that close to prevent blood from going backwards.
A. ventricles
B. valves
C. veins
D. arteries