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Transcript
Notes on Chapter 7 - Section 3 Molecular Movement MAIN IDEA Cell DETAILS DETAILS Made of lipid -Tough & Membrane bilayer (2 layer) flexible Regulates barrier movement into and out of cell Has proteins to -Proteins are help move “carrier” molecules molecules Provide protection & support Diffusion Movement of -Does not molecules require from an area energy of high concentration to an area of low concentration until equal Osmosis The diffusion of water through a selectively permeable membrane - No energy needed -“selects” what can move across -Moves from high to low until equal Effects of Osmosis on Cells & Solution Types Isotonic The amount of Iso=equal solution dissolved substances are the same in the solution as the amount in the cell The movement of water into the cell equals the water out of the cell Hypotonic The amount solution of dissolved substances is lower in the solution outside the cell Water moves into the cell Hypo=less than -Animal cell will swell & burst -Plant cell fills with water, pushing against cell wall Hypertonic solution The amount of dissolved substances outside the cell is greater than what is inside the cell Water moves out of the cell Hyper = greater than -Causes animal cell to lose water & shrink -Plant cell loses water & collapses Solution Types Review Isotonic Hypotonic Hypertonic solution Equal amounts of solutes inside & outside the cell No net movement of water solution Less solutes outside cell Water moves into cell solution More solutes outside cell Water moves out of cell