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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.

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    Transport in Cells How 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 an organism the consequences can be disastrous. Cells and tissues may swell, blood cells burst, or the brain may expand so much it pushes on the skull, leading to brain damage and death. So what exactly is the process that allows organisms to regulate and maintain their water content? Model 1 - Movement of Water In and Out of Cells Water molecules (solvent) Selectively permeable membrane I. A solution consists of a solute and a solvent mixed together. For the solution in Model I identify and provide the symbol for the d. solute. b. solvent. vxxUc 2. Consider the size of the sugar and water molecules in Model I. Which molecules in the diagram in Model 1 are able to move through the selectively permeable membrane? Water 3. Complete the table below by counting the molecules in Model 1. are- srmller Inside the Cell Outside the Cell Number of sugar molecules L w Number of water molecules i F Ratio o f water to sugar 1 . 4 r-i Transport in Cells 1

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    4 . Which solution m Model I is more concentrated- the solution inside the cell or outside o f the cell? Explain your answer in terms o f the ratio o f solute to solvent particles. covsidk U e ofill b t cause Vlnert or* e uoL anxxirtH 5. 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 ; reel t enrS b. 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 concent ration ol the sugar solution o 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 f water, b. The solution outside the cdl w i l l become (merciless) concentrated with the net movement o f water. 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 aqjLxlibrivm ft. The definition of diffusion is the movement o f molecules across a membrane from an area o f high concentration to an area o f low concentration. According to this definition, is the cell in Model I undemennF diffusion? Explain. t * 1 1 . * _ _ . 1 : 4k. m, wxj&wnWf >•*& <4 h) leuJ CcrxfcMw 9- I n the cdl diagram in Model I , where is the higher concentration o f water— inside or outside o f rhe cell? i nsiAe 10. Is the cell in Model 1 undergoing diffusion i f you consider the concentration ol water on either side o f the selectively permeable membrane? Explain. aoinOj idnicfo i s a ttrrn of- POGJL 1 ** Activities for High School Biology 2

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