How do plasma proteins affect fluid balance?

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Plasma is what is left over when the formed elements are removed from the blood. Some of the proteins in plasma are also found in other locations of the body. The proteins in blood are called plasma proteins.

Albumin constitutes approximately 55% of plasma proteins, albumin and erythrocytes are responsible...

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Plasma is what is left over when the formed elements are removed from the blood. Some of the proteins in plasma are also found in other locations of the body. The proteins in blood are called plasma proteins.

Albumin constitutes approximately 55% of plasma proteins, albumin and erythrocytes are responsible for the viscosity of the blood. The concentration of albumin is higher in plasma than it is in interstitial fluid, this causes the osmotic pressure in blood to be greater than interstitial fluid, this is how albumin (plasma protein) regulates blood volume by preventing the water in the blood from moving into the interstitial fluid.

Plasma osmotic pressure is accomplished by osmosis. When you affect blood volume you are also affecting intravascular and extravascular fluid volumes.

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