3.2 osmosis

• role of water as a universal solvent helps with transport, digestion, excretion
• osmosis - net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution)
• adding cell into pure water/dilute solution: hypotonic solution. causes cell to become turgid
• turgor pressure - pressure on the cell wall from the cell membrane pushing upon it
• adding cell into concentrated solution: hypertonic solution. cell becomes flaccid (shrinks). also can become plasmolysis (cytoplasm is pulled away from the wall)
• decreased mass indicates net osmosis out of the cell
• increased mass indicates net osmosis into the cell
• constant mass indicates no net osmosis