The cation that plays a major role in determining the osmotic pressure of the plasma is
A)sodium.
B)potassium.
C)chloride.
D)phosphate.
E)hydrogen ion.

Question

Quizplus · Accepted Answer

Sodium is the main cation in extracellular fluid, and changes in its concentration affect the osmotic pressure of the plasma. A decrease in sodium concentration leads to lower osmotic pressure and an increase in water movement into the cells, while an increase in sodium concentration leads to higher osmotic pressure and an increase in water movement out of the cells. Therefore, sodium plays a major role in determining the osmotic pressure of the plasma.

The Cation That Plays a Major Role in Determining the Osmotic