Fluids and small solutes are forced between cells of the vas

Fluids and small solutes are forced between cells of the vascular endothelium due to osmotic pressure.

Solution

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Exchange of fluids and solutes is important for the transport of vital nutrients across the membranes for the regulation of their metabolic activity. Regulation of pressure balance across the membranes is important to maintain the structural integrity of the membranes. Movement of these takes place by two mechanisms-active transport which requires energy for the movement of particles and passive transport which is based on concentration gradients.

Osmosis is one such passive transport mechanism where water or solutes move down the concentration gradient. Passive transport of particles occurs based on the permeability of the membrane and the concentration gradient which allows them to diffuse from high concentration to low concentration. Fluids also move along with this osmotic gradient produced by the difference in the concentrations of the solutes on both sides of the semipermeable membrane.

Therefore, based on their concentration differences, an osmotic gradient is created which forces the movement of these molecules between the cells.