★ Circulatory and Respiratory System Quiz
The protein molecule that carries oxygen in your red blood cells is ______________.
A. hemoglobin
B. plasma
C. platelets
D. carbon dioxide
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What do your veins do?
A. carry blood away from your heart to the rest of your body.
B. carry blood to your heart from your lungs.
C. are one cell thick, which allows transport through them .
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