★ Circulatory and Respiratory System Quiz
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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Your heart has two sides that pump blood _________________.
A. the left side pumps blood out and the ride side pumps blood in
B. the right side pumps blood out and the left side pumps blood in
C. both pump out and then in at the same time
D. both pump in adn then out at the same time
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