The concentration of salt in the extracellular fluid influences how water enters and leaves cells.

Question

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The concentration of salt in the extracellular fluid, or osmolarity, plays a crucial role in determining the direction of water movement across the cell membrane. When the extracellular fluid is hypertonic, meaning it has a higher salt concentration relative to the intracellular fluid, water will tend to leave the cell in an attempt to balance out the concentrations. Conversely, when the extracellular fluid is hypotonic, meaning it has a lower salt concentration relative to the intracellular fluid, water will tend to enter the cell. This process is essential for maintaining the proper balance of fluids and electrolytes within the body.

The Concentration of Salt in the Extracellular Fluid Influences How