What is the function of platelets in the blood?
A. Acting as a transport medium for nutrients, proteins, ions, and gases
B. Transporting O2 and CO2 in the blood
C. Protecting the body from disease
D. Regulating blood clotting
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What is the main role of venules 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. Returning blood to the heart for another trip throughout the vascular system
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