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[Biology💧]
#🤓everydayscience_biology
其實part 2只係part 1嘅Eng version🙈聽日會再有多啲補充😆
Osmosis refers to the net movement of water molecules from a region of higher water potential to a region of lower water potential through a differentially permeable membrane. Water potential refers to the tendency of a water molecule to move from one place to another.
Cells would gain or lose water by osmosis. However, osmosis may cause excessive water gain or water loss, which may affect the normal functioning of cells. When the cells gain too much water, the cell content is diluted. On the contrary, when the cells lose too much water, the cell content will be concentrated, and the viscosity increases.
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Take red blood cell as an example. When we put some red blood cells into concentrated saline solution, as the conc saline solution has a lower water potential, water in the cell leaves by osmosis, causing the cell to lose water and shrink. In contrast, when we put the red blood cells into distilled water, the cells will gain water by osmosis as the water potential of distilled water is higher than that of the cytoplasm. Water enters the cells by osmosis, causing them to swell, and even burst.
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For plant cells, as they have rigid cell walls, so they won’t burst. But plasmolysis occurs when they lose too much water, this causes the plant to lose turgidity. When they gain water again, they become turgid.
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