★ Respiration, Immune System, Blood Cells Quiz
Where would you find alveoli and what do they do?
A. In the arteries, they stop the artery from bursting.
B. In the heart, and they stop the blood flowing backwards
C. In the lungs and they are they site of gas exchange
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The immune system fights diseases. The circulatory system pairs with the immune system because ___.
A. blood is made in the bones.
B. plasma carries nutrients.
C. red blood cells carry oxygen.
D. white blood cells fight infection.
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