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Unformatted text preview: flow through the organs, muscles and brain can vary dependent upon use. The systemic circuits are actually parallel pathways; blood can "choose" a particular branch, flow through that organ, and then head back to the heart. Blood flow through the various pathways is dynamic and may change to accommodate metabolic changes. For instance, during exercise the amount of blood directed to the digestive organs decreases while the amount of blood to the skeletal muscles increases. While the usual systemic pathway of blood is artery --> capillary bed --> vein, there are several portal systems in the body where blood flows from an artery --> capillary bed (where it picks up nutrients or hormones ) --> portal vein --> capillary bed (where it drops off nutrients or hormones) --> vein. (See Figure 2). Figure 2...
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- Fall '10
- Anatomy, capillary bed