What is the main force for the return of fluids at thevenous end of capillaries?
What is the main force for the return of fluids at the
venous end of capillaries?
The thin-walled tube-like organs of the cardiovascular system that have less blood pressure than arteries and more than veins are defined as capillaries. From the arteries, blood moves to capillaries where the exchange of components (gases, nutrients) occurs with tissue, and the blood then moves to the veins.
There are two types of forces that drive the movement of fluid between the interstitial region and the capillaries. The net pressure which is obtained by the difference of these two forces (as they act in different directions) drives reabsorption. These forces are hydrostatic and osmotic pressure. The main force that allows the return of fluids at the capillaries' venous end is the colloid osmotic pressure in the capillary. In contrast, hydrostatic pressure is responsible for the flow of fluid out of the capillaries.
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