Final answer:
A hypotonic solution is the intravenous solution that causes fluid to shift into the intracellular space, leading to cell expansion and potential lysis.
Step-by-step explanation:
The intravenous solution that shifts fluid into the intracellular space is the hypotonic solution. A hypotonic solution has a lower concentration of solutes compared to the inside of the cell, leading to a higher concentration of water outside the cell.
Intravenous solutions like this result in water moving down its concentration gradient, entering the cell. This process can cause cells to expand and potentially lyse (burst) if the influx of water is significant. It's crucial in medical settings to choose the appropriate intravenous solution based on the patient's needs and the desired effect on the cells and overall fluid balance.