★ The Vascular System and Blood Flow Quiz
Which component makes up about 55 percent of blood and is composed mostly of water?
A. Plasma
B. Red blood cells
C. Platelets
D. White blood cells
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What is the main function of capillaries in the cardiovascular system?
A. Carrying deoxygenated blood to the lungs
B. Regulating blood distribution to the various tissues
C. Exchanging gases and nutrients with the tissues
D. Transporting blood away from the heart
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