In a data flow diagram (DFD), a square represents an internal entity.
Definitions:
Increased Permeability
A condition where a material or membrane allows more substances to pass through it, which can be significant in biological and chemical contexts.
Blood Vessels
Tubular structures that carry blood throughout the body, including arteries, veins, and capillaries.
Edema
Swelling caused by excess fluid trapped in the body's tissues.
Osmotic Balance
The regulation of water and solute concentrations across membranes to stabilize internal conditions of an organism or cell.
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