RT Book, Section A1 Phillips, Raymond E. SR Print(0) ID 1175311560 T1 Circulatory System T2 Venous Insufficiency YR 2021 FD 2021 PB McGraw Hill PP New York, NY SN 9781260461268 LK dermatology.mhmedical.com/content.aspx?aid=1175311560 RD 2024/04/24 AB The circulation is a continuously moving stream of blood that supplies the tissues with nutrients and oxygen and removes the by-products of metabolism from the tissues. Movement of blood depends upon pressure; that is, a force is applied to one portion of the system that drives the fluid contained within into another portion. The pressure involves four components of the circulatory system.