Q:

The total osmotic pressure of human plasma is

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The total osmotic pressure of human plasma is.


  1. About 25 mmHg.
  2. Similar to that of 0.9 per cent saline.
  3. Similar to that of 0.9 per cent glucose solution.
  4. Opposing the tendency of fluid to leave capillaries.
  5. Equal to that of intracellular fluid.

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A. False It is about 5500 mmHg (25 mmHg is the colloid osmotic pressure).

B. True Both have an osmolality around 290 mosmol/litre.

C. False It is similar to 5 per cent glucose which contains about the same number of par-ticles.

D. False The colloid osmotic pressure does this; the crystalloids pass capillary walls freely and exert no effective pressure gradient across the capillary wall.

E. True Intracellular and extracellular fluid have the same osmolality.

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