★ Circulatory & Respiratory Quiz
What is the function of the heart?
A. To pump blood around the body
B. To remove oxygen from the blood
C. To allow blood to flow through it
D. To breath
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Thin-walled vessels that allow for the exchange of O2 , CO2, nutrients and wastes between blood cells or air sacs in the lungs
A. Arteries
B. Veins
C. Capillaries
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