Much of the fluid that moves across capillary walls and into the tissues moves as a result of filtration, forced by blood pressure. O₂, on the other hand, travels from the capillaries into the tissues because:

Question

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O₂, which is a placeholder for a specific substance (not specified in the question), moves from the capillaries into the tissues due to a concentration gradient between the substance in the tissues and in the blood. This implies that the movement is from an area of higher concentration to an area of lower concentration, a fundamental principle of diffusion.

Much of the Fluid That Moves Across Capillary Walls and into the Tissues