Topics: The Blood Quiz
Which blood vessel has valves to prevent the back-flow of blood?
A. Veins
B. Arteries
C. Capillaries
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What is the function (job) of the white blood cells?
A. To transport oxygen around the body.
B. To carry dissolved sugars.
C. To clot and cover wounds like cuts and grazes.
D. To release antibodies to help destroy infections.