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| 1 | |
The membrane of red blood cells, like most other cells in your body, has |
| | A) | numerous open sodium channels; more than for any other ion. |
| | B) | many open sodium channels. |
| | C) | very few open sodium channels. |
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| 2 | |
When a red blood cell is placed in hypertonic (very concentrated) solutions of NaCl: |
| | A) | sodium ions rush into the cell, down the concentration gradient. |
| | B) | sodium ions rush out of the cell, down the concentration gradient. |
| | C) | sodium ions may enter the cell, but are pumped out by the Na/K-ATPase pump. |
| | D) | sodium ions may leave the cell, but are pumped back in by the Na/K-ATPase pump. |
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| 3 | |
When a red blood cell is placed in hypertonic (very concentrated) solutions of NaCl: |
| | A) | water leaves the cell, and the cell swells. |
| | B) | water leaves the cell, and the cell shrinks. |
| | C) | water enters the cell, and the cell swells. |
| | D) | water enters the cell, and the cell shrinks. |
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| 4 | |
Low transmittance values indicate that the red blood cells have lost water and have shrunk. According to your data, what range of concentrations of NaCl produced this effect? |
| | A) | 200 to 240 mM. |
| | B) | 120 to 160 mM. |
| | C) | 0 to 200 mM. |
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| 5 | |
When a red blood cell is placed in hypotonic (very dilute) solutions of NaCl: |
| | A) | water leaves the cell, and the cell shrinks. |
| | B) | water leaves the cell, and the cell swells. |
| | C) | water enters the cell, and the cell shrinks. |
| | D) | water enters the cell, and the cell swells. |
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| 6 | |
When a red blood cell is placed in hypotonic (very dilute) solutions of NaCl: |
| | A) | sodium ions rush into the cell, down the concentration gradient. |
| | B) | sodium ions rush out of the cell, down the concentration gradient. |
| | C) | some sodium ions may leave the cell. |
| | D) | some sodium ions may enter the cell. |
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| 7 | |
High transmittance values indicate that the red blood cells have swollen or burst. According to your data, what concentrations of sodium chloride produced this effect? |
| | A) | 0 to 120 mM. |
| | B) | 150 to 180 mM. |
| | C) | 200 to 250 mM. |
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| 8 | |
When a red blood cell is placed in isotonic solutions of NaCl: |
| | A) | water enters the cell, and the cell swells and bursts. |
| | B) | water neither leaves nor enters the cell; the cell neither swells nor shrinks. |
| | C) | water leaves the cell, and the cell shrinks. |
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| 9 | |
Look at your data. Transmittance values that are intermediate between those seen in dilute and concentrated solutions were found in NaCl solutions: |
| | A) | between 0 and 100 mM. |
| | B) | between 140 and 180 mM. |
| | C) | between 200 and 240 mM. |
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| 10 | |
Some NaCl solutions gave transmittance values that were intermediate between those seen in dilute and concentrated solutions. In these solutions: |
| | A) | water entered the cell, and the cell swelled and burst. |
| | B) | water neither left nor entered the cell; the cell neither swelled nor shrank. |
| | C) | water left the cell, and the cell shrank. |
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