Tag Archives: cells

[Biology] #everydayscience_biology 今日等我黎講下滲透(osmosis)啦 喺日常生活入面我地未必會成日都聽到滲透呢一樣野,但…

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[Biology💧]
#🤓everydayscience_biology
今日等我黎講下滲透(osmosis)啦😆
喺日常生活入面我地未必會成日都聽到滲透呢一樣野,但係其實佢喺好多地方都進行緊。滲透係水分子經過半透膜擴散嘅一個現象。水分子會由高水勢嘅區域滲入去低水勢嘅區域,直至細胞入面同細胞外面嘅濃度達到平衡為止。
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細胞會藉住滲透作用黎吸到水分又或者係喪失水分。但係有可能會因為咁而得到過多嘅水分又或者係失去太多嘅水。
或者用個例子黎講會比較易明。當我地將細胞放入濃嘅鹽水入面,由於濃嘅鹽水入面水的含量比例比細胞質低,細胞入面嘅水會不斷咁向細胞外面滲透,導致細胞脫水同萎縮。相反,將細胞放入蒸餾水入面嘅話呢,由於細胞入面嘅水含量比例比蒸餾水低,外面嘅水分子會不斷咁向細胞入面滲透,導致細胞膨脹,甚至破裂。
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而對於植物細胞呢,因為佢地嘅細胞壁同細胞膜嘅滲透性唔一樣,當細胞外嘅濃度高過入面嘅時候,細胞會出現質壁分離嘅現象,即係細胞壁同細胞膜分離。但係當佢地吸返水之後就會出現質壁分離嘅復原現象。
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#everydayscience #science #physics #chemistry #biology #plants #animals #organisms #livingthings #earth #mothernature #chloroplasts #ATP #mitochondria #foodproducer #energy #foodchain #originoflife #question #nevergiveup #AlbertEinstein #nature #world #cells #cellmembrane #osmosis

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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…

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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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#everydayscience #science #physics #chemistry #biology #plants #animals #organisms #livingthings #earth #mothernature #chloroplasts #ATP #mitochondria #foodproducer #energy #foodchain #originoflife #question #nevergiveup #AlbertEinstein #nature #world #cells #cellmembrane #osmosis

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CarbLoaded: A Culture Dying to Eat (International Subtitles Version)



Subtitles Languages: Arabic, Chinese, English, French, German, Hindi, Indonesian, Italian, Polish, Portuguese, Spanish, Swedish (more coming) Watch …

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