The tendency for water and small solutes to move out of the blood is greatest at the

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The arteriole end of capillaries has a higher hydrostatic pressure due to the pumping action of the heart, which leads to a greater tendency for water and small solutes to move out of the blood and into the interstitial fluid. At the venous end of capillaries, there is a net movement of water and small solutes back into the blood. The transitions between elastic and muscular arteries, and between venules and medium-sized veins, do not have significant impact on the movement of water and small solutes.

The Tendency for Water and Small Solutes to Move Out