Blood osmotic pressure is normally lower at the arteriolar end of a capillary than at the venular end.

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Quizplus · Accepted Answer

This is because water moves from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration). At the arteriolar end of the capillary, the blood has a higher solute concentration, so water tends to move out of the capillary and into the surrounding tissues, resulting in a lower osmotic pressure. At the venular end, the blood has a lower solute concentration, so water tends to move into the capillary, resulting in a higher osmotic pressure.

Blood Osmotic Pressure Is Normally Lower at the Arteriolar End