Most permeable capillaries
a. The permeability of the glomerular capillaries is about 50 times that of the capillaries in muscles.
b. Kidney can filter 125 ml/min or 7.5 l/h or 180L/day (GFR) → it shows that no organs in the body other than kidney, permeable to such extent.
c. Since GFR is governed by the size of capillary bed, the permeability of the capillaries, and the hydrostatic and osmotic pressure gradient across the capillary wall.