What effect do hypotonic fluids have on the osmotic balance in the body?

Hypotonic fluids have a lower concentration of solutes compared to the fluid in the cells. When hypotonic fluids are administered, this difference in osmolarity leads to a reduction in osmotic pressure in the extracellular space. As a result, water moves into the cells in an attempt to equalize the osmotic balance between the intracellular and extracellular environments. This movement of water causes the cells to swell. In situations where hydration or restoration of cellular fluid balance is necessary, hypotonic fluids can effectively promote fluid entry into cells, thereby supporting cellular function and hydration.

In contrast, the other options suggest various effects that do not align with the nature of hypotonic solutions, which primarily result in the movement of water into cells due to lower solute concentration outside the cells.