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xhan's picture

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Hypothesis: the bigger the micron the slower the movement.
2 microns:
10 micrometers per minute
4 microns:
2 micrometers per minute
8 microns:
Movement too slow to detect (per minute?)
Conclusion: conclusion matches hypothesis

1% saline solution: normal-looking cells
25% saline solution: heavily shriveled cells. Looked like small, sharp fragments of broken glass.
Distilled water: returned to normal brick-like cell shape, maybe a little larger.

Observations: when we added the water we moved the slide from left to right following the movement of the water and observed the changes in the cell sizes/shapes.
When we added 25% salt solution(NaCl), the cell membrane tended to shrink, because the salinity of the solution outside the cell was higher than the liquid inside the cell, thus the water on the inside diffused to the outside(high concentration to low concentration). When we added distilled water, the cell membrane expanded because the concentration of water was higher on the outside as opposed to the inside, so the water diffused to inside.

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