OSMOSIS

• WHAT IS OSMOSIS?

  movement of water from an area of higher water potential to an area of lower water potential across a partially permeable membrane
• HIGHER WATER POTENTIAL?

  less negative due to less solute
• LOWER WATER POTENTIAL?

  more negative due to more solute
• WHAT IS WATER POTENTIAL?

  pressure created by water molecules, measured in kPa
• WATER POTENTIAL OF PURE WATER?

  0 kPa
• WHAT IS AN ISOTONIC SOLUTION?

  water potential is the same in the solution and the cell
• WHAT IS A HYPOTONIC SOLUTION?

  water potential of the solution is higher than the water potential in the cell
• WHAT IS A HYPERTONIC SOLUTION?

  water potential of the solution is lower than the water potential in the cell