In the human heart, ____.
A. ventricle walls are more thickly muscled than the atrial wall.
B. atrial contraction helps to drive blood circulation throughout the body.
C. the right ventricle has thicker walls than the left ventricle.
D. the left ventricle pumps blood to the lungs.
E. the atrial walls are as thick as the ventricle walls.
Answer: A
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