[ 345 ] Life Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Water moves easily across cell membranes through special protein-lined channels. If the total concentration of all dissolved solutes is not equal on both sides, there will be a net movement of water molecules into or out of the cell. The diagram shows red blood cells in solutions with three different salt concentrations. Red Blood Cells in Solutions of Different NaCI Concentrations Hypertonic Isotonic Hypotonic H 2 O H 2 O H 2 O H 2 O According to this diagram, when will homeostasis occur in red blood cells? A. when the osmotic pressure of water is equal B. when the concentration of salt is higher outside the cell C. when the amount of water inside the cell is higher than outside the cell D. when the osmotic flow of water out of the cell is greater than salt solution inside the cell