The flowing blood as it is encountered in the circulatory system as distinguished from blood that has been removed from the circulatory system or sequestered in a part; thus, something added to the b. may be expected to become distributed to all parts of the body through which blood is flowing.
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blood·stream -.strēm n the flowing blood in a circulatory system
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blood·stream (bludґstrēm) the blood flowing through the circulatory system in the living body. Written also blood stream.Medical dictionary. 2011.