Key distinction – Osmotic press vs Oncotic pressure  

Osmotic pressure and oncotic press are 2 important facets of physiology that help explain the movement of solute and also solvent molecules into and out the the blood capillary system, though there is a distinct difference in between these two terms. Castle are important in bringing about the exchange the nutrients in between blood and tissue components of the body. Osmotic pressure and oncotic press are both referred to as ‘Starling’s forces’ in physiology. The an essential difference in between them is the Osmotic pressure is the pressure emerged by solutes dissolved in water working throughout a selectively permeable membrane if Oncotic pressure is a part of the osmotic pressure created by the bigger colloidal solute components.

You are watching: Difference between hydrostatic and osmotic pressure

To understand the difference in between both this forces, us shall an initial take a look at what castle are and then just how they help in our physiology.

 What is Osmotic pressure?

Osmotic press is the pressure required to stop ‘osmosis’. Osmosis is the procedure where solvent molecules, such as water, in a solution tend to relocate from a an ar of low solute concentration to a region of high solute concentration across a semi-permeable membrane i.e. A membrane the is impermeable to the solute molecules however permeable to solvent molecules.Specifically, osmotic push is the press exerted through the solute molecules preventing the movement of solvent molecule from a region of low solute concentration to a an ar of high solute concentration across a semi-permeable membrane. Osmotic push is additionally called hydrostatic pressure, and also it relies on the concentration that solute molecules on either next of the semi-permeable membrane.

 What is Oncotic pressure?

Oncotic pressure is a part of the osmotic pressure, an especially in biological fluids such together plasma. Oncotic press is exerted through colloids or, in other words, proteinaceous macromolecules the the plasma choose albumin, globulin, and also fibrinogen. Oncotic pressure is therefore also called ‘colloid osmotic pressure.’ Albumin is the most abundant of all three proteins and contributes to around 75% that the exerted oncotic pressure. The full osmotic pressure of blood plasma is well-known to it is in 5535 mmHg, and also the oncotic press accounts for around 0.5% of the i.e. Approximately 25 to 30 mmHg.

Osmotic pressure and oncotic press are also known together Starling’s forces. Both these forces together administer the passive directional motion of water and also nutrients of the plasma out of the capillaries and also into the interstitial fluid (at the arterial end) and vice versa (at the venous end); this phenomenon constitutes Starling’s principle of transvascular liquid dynamics. Both of these forces work in different ways at both the arterial and venous ends of the capillary bed to bring about the suitable exchange the water and nutrients in the tissue. At the arterial finish of the capillary bed, the osmotic pressure is greater than the oncotic pressure within the capillaries, hence water and nutrients relocate out that the capillaries right into the interstitial fluid, conversely, at the venous finish , the osmotic press is reduced than the oncotic press within the capillaries and water is reabsorbed right into the capillaries from the interstitial fluid. Hence, both osmotic and also oncotic press serve as essential forces in blood circulation.

Filtration and re-absorption existing in capillaries.

What is the difference in between Osmotic pressure and Oncotic Pressure?

Definition of Osmotic Pressure and Oncotic Pressure

Osmotic pressure: Osmotic pressure is the press exerted to stop the activity of totally free solvent molecules throughout a semi-permeable membrane right into a region of high solute concentration.

Oncotic pressure: Oncotic push is the pressure exerted by colloidal plasma protein to reabsorb water ago into the blood system.

Characteristics of Osmotic Pressure and Oncotic Pressure


Osmotic pressure: the osmotic pressure stays clear of the activity of water throughout the membrane from a region of high solute concentration come a region of low solute concentration.

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Oncotic pressure: Oncotic pressure reabsorbs and moves water throughout a membrane native a region of high solute concentration to a an ar of low solute concentration.


Osmotic pressure: the is exerted by low molecular weight molecules (small proteins, ions, and also nutrients)

Oncotic pressure: it is exerted by big molecular weight molecules (plasma proteins v Mw > 30000)

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Filed Under: biology Tagged With: to compare Osmotic pressure and Oncotic pressure, hydrostatic pressure, Oncotic pressure, Oncotic push characteristics, Oncotic push definition, osmotic pressure, Osmotic pressure and Oncotic pressure differences, Osmotic push characteristics, Osmotic push definition, Osmotic press vs Oncotic pressure


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