How does solutes enter and exit the lumen of the blood vesse

Solution

Solutes enter and exit the blood vessels\' lumen through capillary diffusion. The hydrostatic pressure in capillaries allow the solutes according to concentration gradient. The direction and flow of solutes and fluid in capillaries mainly depend on hydrostatic pressure and capillary colloid osmotic pressure. therefore, the solutes enter and exit the lumen of blood vessels through osmosis.