QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
"Q^7. A SimCell with a water-permeable membrane that contains 20 hemoglobin molecules and 480 water molecules is placed in an extracellular fluid that contains 40 dextrose molecules and 960 water molecules.
Which of the following should happen?
A. More water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.
B. More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid.
C. There will be no movement of water molecules across the membrane.
D. Water molecules will move back and forth equally across the membrane."
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Answer
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Step 1: Identify the initial concentration of solutes and solvent in both the SimCell and the extracellular fluid.
The SimCell contains 20 hemoglobin molecules and 480 water molecules, while the extracellular fluid contains 40 dextrose molecules and 960 water molecules. The number of water molecules in the SimCell and extracellular fluid is 480 and 960, respectively.
Step 2: Calculate the concentration of solutes (osmolarity) in both the SimCell and the extracellular fluid.
In the SimCell, there are 20 hemoglobin molecules, and each molecule can be considered as one unit of solute. Therefore, the osmolarity inside the SimCell is 20 osmoles/L (osmol/L). In the extracellular fluid, there are 40 dextrose molecules, each of which can be considered as one unit of solute. Therefore, the osmolarity in the extracellular fluid is 40 osmol/L.
Final Answer
A. More water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.
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