The main water-pushing force in the blood capillaries is

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Blood pressure is the main force that pushes water out of the blood capillaries and into the surrounding tissues. This pressure is generated by the contraction of the heart and maintained by the elasticity of the blood vessels. Sodium and protein may also contribute to the movement of water, but they are not the primary driving force. Sodium in the blood plasma and interstitial fluid can create an osmotic gradient that affects the movement of water, while protein in the blood plasma can create an oncotic pressure that opposes the outward flow of water. However, these factors are secondary to blood pressure in determining the direction and rate of fluid movement across the capillary walls.

The Main Water-Pushing Force in the Blood Capillaries Is