Movement Through the Cell Membrane Notes on Chapter

Movement Through the Cell Membrane Notes on Chapter 7 - Section 3 Molecular Movement

MAIN IDEA DETAILS �Made of lipid � Cell -Tough & Membrane bilayer (2 layer) flexible �Regulates barrier movement into and out of cell �Has proteins to -Proteins are help move “carrier” 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 of dissolved solution 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 �The amount solution of dissolved substances outside the cell is greater than what is inside the cell �Water moves Hyper = greater than -Causes animal cell to lose water & shrink -Plant cell loses water & collapses

Solution Types Review Ø Isotonic Ø Hypertonic solution Equal amounts of solutes inside & outside the cell Ø No net movement of water Ø solution Less solutes outside cell Ø Water moves into cell Ø solution More solutes outside cell Ø Water moves out of cell Ø