Download Osmosis - Perry Local Schools

Friday, January 4
Bell Work:
Complete day 3 of the Observing Osmosis
Lab. The corn syrup solution goes into the
bucket, not the sink.
Osmosis: Diffusion of water across a selectively permeable membrane.
­Important because cells cannot function properly without enough water.
1
Isotonic
(Equal)
Hypotonic
(Under)
Hypertonic
(Over)
Isotonic
• Water moves in and out of the cell at the same rate.
• H2O concentration inside equals H2O concentration outside
• Cells retain normal shape
2
Isotonic
Hypotonic
• Water moves into the cell causing it to swell.
• Extremely hypotonic solution can cause plasma membrane to burst.
• Plant cells do not burst because of cell wall. Plant appears plump.
• Reason why grocery stores mist water on produce.
3
Hypotonic
Hypertonic
• Water flows out of the cell
• Animal cells shrivel because of loss of water
• Plant cells the cell membrane and cytoplasm shrink away from the cell wall
• Causes wilting of plants.
4
Hypertonic
5