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Key el Na+ transport channel Figure A Figure B For the figures above, the inner circle represents a cell which is surrounded by a solution. For the purposes of these questions, assume each molecule of Nat - 1 M and each molecule of Ca2+ 2M. Assume each molecule of H20 represents 100 mL. Hint: Dont overthink these! ) Figure A: Suppose the cell pictured is at its normal volume and has a semipermeable membrane. A) Which of the 3 molecules in the figure can cross the membrane? B) What is the osmolarity of The cell? The solution? c) Will the volume of the cell change? If so, by how much/how little? D) Is the surrounding solution hypertonic, isotonic, or hypotonic? Il) Figure B: Suppose the cell pictured is at its normal volume and has a selectively permeable membrane. A) This membrane is permeable to water. Which of the 2 substrates in the figure can also cross the membrane? B) Following crossing, how many particles of each substrate will be present in the cell? In the solution?

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