The circulatory system functions to transport substances and maintain circulation through blood vessels, the pulmonary and systemic circuits, and the components of blood.
Blood vessels: arteries (carry blood away from the heart), veins (bring blood back to the heart), capillaries (exchange of nutrients and waste).
Pulmonary vs. systemic circulation: pulmonary - between heart and lungs for oxygenation, systemic - between heart and body for circulation.
Components of blood: plasma, red blood cells, white blood cells, platelets.
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