Medical Quiz

Circulatory & Respiratory System Quiz

Help fight infections from bacteria, viruses and other invading substances. These are bigger and fewer cells, but increase in number when you are sick.

A. plasma

B. red blood cells

C. white blood cells

D. platelets

Select your answer:
     


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Help clot the blood to keep you from bleeding to death when you are injured. They are cell fragments.

A. plasma

B. red blood cells

C. white blood cells

D. platelets



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