Osmosis

3.A.10OsmosisDrill1. What structure is common to ALL cell types?ChloroplastPlasma MembraneCell WallMitochondriaFlagella

2. The cell membrane is described as ____________ because it allows some substances to cross and restricts others.

PermeableImpermeableSemi-permeableIsotonic

EndObjective SWBAT (student will be able to) explain how water is transported through the cell by learning about osmosis.

EndAgendaLecture Osmosis Isotonic:When solute concentration in the environment is equal to that in the cell.Hypertonic:Solute concentration in the environment is higher than that in the cell.Hypotonic:Solute concentration in the environment is lower than in the cellActivity Osmosis Lab2006-2007

OsmosisMovement of Water Across Cell Membrane

diffusion of water

Water diffuses when it moves across cell membrane.5Vocabulary

VocabularySolute: Substance dissolved (sugar or salt)

Solvent: Liquid part (water)

Solution: Solute and solvent (salt water)

OsmosisDiffusion across a membraneInvolves the movement of waterOccurs when one molecule can not move across the membraneIn order to reach equilibrium water has to move

OsmosisOsmosisdiffusion of water from HIGH concentration of water to LOW concentration of wateracross a semi-permeable membrane

9Water can movesugar cant

WatermoleculeSelectivelypermeablemembraneSolutemoleculeH2OLowerconcentrationof soluteHigherconcentrationof soluteEqualconcentrationof soluteSolute molecule withcluster of water moleculesNet flow of water???What is a selectively permeable membrane????What is a selectively permeable membrane?The plasma membrane is said to be selectively permeable because it allows the passage of some solutes but not others.e.g.if sugar fits a channel through the plasma membrane.This makes this one of the important properties of the plasma membrane of all cells.

Cell MembranePlasma MembranePhospholipid Bilayer:Fluid like a soap bubble resulting from pushing and pulling of phospholipids by water.???Water moves from an area of _______ water concentration to an area of _____ water concentration

Keeping water balanceCell survival depends on balancing water uptake & water lossfreshwaterbalancedsaltwater15Vocabulary Hyper: a lotHypo: a littleIso: unchangedTonicity: pressureOsmosisWater always moves to the sugar/salt

Water moves to balance the inside and outside of the cellHypertonic SolutionSolutionCellHigh amount of sugar in the solutionLow amount of sugar in the cell Hypertonic SolutionSolutionCellHigh amount of sugar in the solutionLow amount of sugar in the cell Hypertonic SolutionExample: raisins are dried grapes that were put in sugar solution.

Water moves outside of the cellHypotonic SolutionSolutionCellLow amount of sugar in the solutionHigh amount of sugar in the cell Hypotonic SolutionSolutionCellLow amount of sugar in the solutionHigh amount of sugar in the cell Hypotonic Solution

Water moves inside of the cellIsotonic SolutionSolutionCellEqual ratios in a solution and cellIsotonic SolutionSolutionCellEqual ratios in a solution and cell

Isotonic solutionHypotonic solutionHypertonic solutionH2OH2O(1) Normal(2) LysedH2OH2OH2OH2OAnimalcellPlantcell(4) Flaccid(5) Turgid(6) Shriveled (plasmolyzed)(3) ShriveledPlasmamembraneH2OH2OSee page 83Controlling waterContractile vacuole in Paramecium

27Osmosis and Animal Cells

Osmosis and Plant Cells

30Osmosis in Red Blood Cells

IsotonicHypotonicHypertoniccopyright cmassengaleThe Plasma Membrane1/4/2015G. Podgorski, Biol. 101030Hypotonic

Hypertonic

Isotonic

Blood cells in different solutions

ClassworkGummy Bear Osmosis Lab