Normal regulation of fluid transport
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From physiology you should be able to remember Starling's hypothesis or law that pertains to regulation of normal fluid transport from the blood into the tissues: the oncotic pressure of the blood nearly balances the outflow that is produced by hydrostatic pressure. The net result is movement of fluid out of the circulation at a relatively slow rate, after which it is carried back to the circulation by lymphatics. Once you understand this principle, you can deduce what is causing non-inflammatory edema to occur, given the appropriate clinical data.