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PHY2011 - Neuroscience of communication, sensory and control systems - S1 2025

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Which of the following statements about the red blood cells in Figure B is true?

Image failed to load: RBCs in solution A and B 2

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What is the Tonicity of a solution of 180 mM  urea + 100mM sucrose (Cane Sugar) compared to the tonicity of a Red Blood Cell?

 (Assume the tonicity of a Red Blood Cell to be 280 mOsm and the Molecular Weight of Sucrose =340 and the Molecular Weight of Urea=60)

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Compared to an RBC with intracellular osmolarity and tonicity of 280 mOsm, an extracellular solution of 280 mM Sucrose and 20 mM Dimethyl Urea is 

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The Molarity of 100% physiological saline is 280 mOsm

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Twenty percent physiological saline will have a concentration of

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What is the Tonicity of a solution of  3.0% urea compared to the tonicity of a Red Blood Cell?

 (Assume the tonicity of a Red Blood Cell to be 280 mOsm and the Molecular Weight of Urea=60)

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What is the Osmolarity of 3.4% sucrose compared to 100% Physiological Saline?  

(Assume Osmolarity of 100% physiological Saline to be 300 mOsm and the molecular weight of sucrose to be 340)

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Passive, directional movement of molecules is part of the process called _____

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If mammalian Red Blood Cells are placed in a solution and the cells swell, then the solution is likely to be

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Which of the following molecules would have the greatest permeability through a cell membrane?

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