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11 Transport in Cells S

This worksheet explores how water moves in and out of cells through osmosis. Using a model with sugar and water molecules, it examines selectively permeable membranes and helps students analyze molecule movement, ratios inside outside the cell.

Daniel Miller
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Transport in CellsHow d o water molecules move in and out of cells?Why? ________________________________________________________Water accounts for over 70% of the human body. If water levels arc not regulated and maintained in anorganism the consequences can be disastrous. Cells and tissues may swell, blood cells burst, or the brainmay expand so much it pushes on the skull, leading to brain damage and death. So what exactly is theprocess that allows organisms to regulate and maintain their water content?Model 1 - Movement of Water In and Out of CellsWater molecules (solvent)Selectively permeable membraneI. A solution consists of a solute and a solvent mixed together. For the solution in Model I identifyand provide the symbol for thed.solute.b.solvent.vxxUc2. Consider the size of the sugar and water molecules in Model I. Which molecules in the diagramin Model 1 are able to move through the selectively permeable membrane?Water3. Complete the table below by counting the molecules in Model 1.are- srmllerInside the CellOutside the CellNumber of sugar moleculesLwNumber of water moleculesi FRatio o f water to sugar1 . 4r-iTransport in Cells1

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4 . Which solution m Model I is more concentrated-the solution inside the cell or outside o f thecell? Explain your answer in terms o f the ratio o f solute to solvent particles.covsidk U e ofill b t causeVlnert or*e uoL anxxirtH5. Consider the arrows indicating movement o f water across the membrane.rf.I n which direction are wafer molecules moving— into or out o f the cell?J ; reeltenrSb.Arc more water molecules moving into or out of the c dI?C.Is the net direction o f water movement into or out o f the cell?exA"6 . Circle the correct word below to indicate the change i n the concentration ol the sugar solutiono n each side o f the membrane as water molecules move.rf.T h e solution inside the cell will become {rnorj kss) concentrated with the net movement o fwater,b.The solution outside the cdl w i l l become (merciless) concentrated with the net movement o fwater.7. Applying what you already know about the random movement o f molecules, what will eventu-ally happen to the concentration on both sides o f the membrane?reach aqjLxlibrivmft. The definition of diffusion is the movement o f molecules across a membrane from an area o fhigh concentration to an area o f low concentration. According to this definition, is the cell inModel I undemennF diffusion? Explain.t* 1 1.*__ . 1:4k.m, wxj&wnWf>•*& <4 h) leuJCcrxfcMw9- I n the cdl diagram in Model I , where is the higher concentration o f water— inside or outside o frhe cell?insiAe10. Is the cell in Model 1 undergoing diffusion i f you consider the concentration ol water on eitherside o f the selectively permeable membrane? Explain.aoinOjidnicfo i s a ttrrnof-POGJL1**Activities for High School Biology2
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Biology

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