★ Circulatory & Respiratory System Quiz
Which vessels in the circulatory system are responsible for transporting materials back to the heart?
A. alveoli
B. arteries
C. capillaries
D. veins
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Carry oxygen in the blood and are small disk-shaped cells that have no nucleus and are made mostly of hemoglobin.
A. plasma
B. red blood cells
C. white blood cells
D. platelets
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