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
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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Subject
Biology