Diffusion and Osmosis 1 2 3 4 5 Across Down 2. A dilute solution contains a high concentration of water molecules and is said to have a high ................. 1. In a very concentrated solution, the cell undergoes full ......................... as the cells lose more water. 4. ................... is fully permeable to all molecules and supports the cell and stops it bursting when it gains water by osmosis. 3. In a more concentrated solution (low water potential), the cell contents lose water by osmosis. They shrink and pull away from the cell wall. The cell becomes ............................ 5. The diffusion of water molecules, from a region where the water molecules are in higher concentration, to a region where they are in lower concentration, through a partially permeable membrane.