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circulation

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circulation

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Human circulatory system. Oxygen-rich blood is shown in red, oxygen-poor blood in blue. The …
(credit: © Merriam-Webster Inc.)
Process by which nutrients, respiratory gases, and metabolic products are transported throughout the body. In humans, blood remains within a closed cardiovascular system composed of the heart, blood vessels, and blood. Arteries carry blood away from the heart under high pressure exerted by the heart's pumping action. Arteries divide into smaller arterioles, which branch into a network of tiny capillaries with thin walls across which gases and nutrients diffuse. Capillaries rejoin into larger venules, which unite to form veins, which carry blood back to the heart. (See artery; capillary; vein.) The right and left heart chambers send blood into separate pulmonary and systemic circulations. In the first, blood is carried from the heart to the lungs, where it picks up oxygen and releases carbon dioxide; in the second, blood is carried between the heart and the rest of the body, where it carries oxygen, nutrients, metabolic products, and wastes.
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It has a pulse, arteries, spasms; and I agree with the learned Maury, who discovered in it a circulation as real as the circulation of blood in animals.
20,000 Leagues Under The Sea by Verne, Jules View in context
By multipying the means of gratification, by promoting the introduction and circulation of the precious metals, those darling objects of human avarice and enterprise, it serves to vivify and invigorate the channels of industry, and to make them flow with greater activity and copiousness.
Federalist Papers Authored by Alexander Hamilton by Hamilton, Alexander View in context
You should be out, whipping up the circulation like Mr.
Dr. Jekyll and Mr. Hyde by Stevenson, Robert Louis View in context
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