Capillary exchange involves movement of what between blood and interstitial fluid?

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Capillary exchange centers on the movement of fluids (water) and dissolved substances (solutes) between the blood and the interstitial fluid. The capillary wall lets water and many small dissolved particles pass through, so nutrients and ions can leave the blood to nourish tissues and waste products can return to the blood for removal. Gases do diffuse across capillary walls as well, but the broad, defining idea is the transfer of liquids and solutes between plasma and interstitial fluid. Hormones travel in the blood, and nerve impulses are not exchanged across capillary walls in the same way, so they aren’t the primary focus of capillary exchange.