Final answer:
In venous congestion, the feet, ankles, and fingers become swollen due to the accumulation of excess fluid in the tissue. This occurs when blood accumulates in the veins, increasing pressure and causing fluid to flow out of capillaries.
Step-by-step explanation:
In venous congestion, the feet, ankles, and fingers become edematous (swollen). This occurs when blood accumulates in the veins, increasing pressure within them and leading to the flow of fluids out of capillaries and into the interstitial fluid. The excess tissue fluid around the cells results in edema.