1. Consequently, the intravascular oncotic pressure reduces relative to the interstitial tissue. 2. The oncotic pressure on glomerular capillaries is one of the forces that resist filtration. 3. The difference in the COP of the blood and tissue is called the oncotic pressure . 4. This provides an oncotic pressure for ions to enter the vasa recta from the interstitium. 5. Both these effects decrease the contribution of the oncotic pressure gradient to the net driving force. 6. Because hydrostatic pressures in the tubules, interstitium and peritubular capillaries are normally equivalent, oncotic pressures govern flow. 7. Because blood proteins cannot escape through capillary endothelium, oncotic pressure of capillary beds tends to draw water into the vessels. 8. The oncotic pressure is in direct opposition with the hydrostatic pressure and tends to draw water back into the capillary by osmosis. 9. The total oncotic pressure of an average capillary is about 28 mmHg with albumin contributing approximately 22 mmHg of this oncotic pressure. 10. The total oncotic pressure of an average capillary is about 28 mmHg with albumin contributing approximately 22 mmHg of this oncotic pressure . 
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