Final answer:
If extracellular water has an excess of sodium ions, water will leave the cell and the cell may shrink or shrivel. As a result, the cell may shrink or shrivel.
Step-by-step explanation:
In a situation where extracellular water has an excess of sodium ions, the extracellular fluid is hypertonic compared to the cell's cytoplasm.
This means that the extracellular fluid has a higher osmolarity than the cell's cytoplasm, causing water to leave the cell. As a result, the cell may shrink or shrivel.