Topics: Human Circulatory System Quiz
What are the blood cells?
A. Erythrocytes, leukocytes, and platelets.
B. The buffy coat and plasma proteins.
C. Blood cells, cell fragments, and plasma.
D. All compounds synthesized by the blood.
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When the atria contract, blood is squeezed into _________.
A. the ventricles
B. the valves
C. the veins
D. the arteries