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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 A is true?
What is the Osmolarity of a solution of 0.28 M Urea compared to 100% Physiological Saline?
(Assume Osmolarity of 100% physiological Saline to be 300 mOsm and the Molecular Weight of Urea = 60)
(Assume Osmolarity of 100% physiological Saline to be 300 mOsm and the Molecular weight of Sucrose = 340)
Given three compounds, all stated to be of similar size and chemistry, but with the following Log P oct:water values:
| Compound A | Compound B | Compound C |
| -2.9 | -1.4 | +0.9 |
you would expect that permeation of these compounds into a mammalian RBC would, in order of speed from fastest to slowest, be
An ideal Semi-permeable membrane is permeable
If mammalian Red Blood Cells are placed in a hypertonic solution which one of the following will happen?
A cell that is hypertonic to its environment
(Assume Osmolarity of 100% physiological Saline to be 300 mOsm and NaCl is completely dissociated)
What is the Osmolarity of a solution of 1 M Urea + 0.154 M NaCl, compared to 100% Physiological Saline?
(Assume Osmolarity of 100% physiological Saline to be 300 mOsm, Molecular Weight of Urea = 60 and NaCl is completely dissociated)