Noun
collateral circulation (countable and uncountable, plural collateral circulations)
(anatomy) The circulation of blood through a network of vessels that is developed through enlargement of secondary vessels and use of existing anastomoses between adjacent vessels when a major vein or artery is functionally impaired, as by obstruction.
Using a quantitative model, loss of this “first-pass metabolism” due to portal collateral circulation can account for the hyperammonemia observed in chronic liver disease, and there is usually no need to implicate hepatocyte malfunction. Source: Internet
Proper exercise can condition the muscles to use oxygen effectively and can speed the development of collateral circulation. Source: Internet