Question

In multicellular organisms, homeostasis generally includes maintaining an isotonic extracellular fluid so that cells do not shrink or burst. What happens to water in the organism when cells are bathed in an isotonic extracellular solution?
Water moves into the cell.
Water moves out of the cell.
Water does not move into the cell or out of the cell.
Water moves into the cell and out of the cell equally.

Answer 1

When cells are bathed in an isotonic extracellular solution, water moves into the cell and out of the cell equally. This is because the concentration of solutes inside the cell is the same as the concentration of solutes in the extracellular fluid, resulting in no net movement of water. Overall, the water movement is balanced, and the overall volume of the cell remains stable.