Osmotic Pressure Outside the Cell During Dehydration

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Osmotic pressure is the pressure required to prevent the flow of water across a semi permeable membrane. Find out about osmotic pressure outside the cell during dehydration with help from an experienced science professional in this free video clip.

Part of the Video Series: The Marvels of Cells & DNA
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Hi, I'm Michael Maidaa, and this is osmotic pressure outside the cell during dehydration. Osmotic pressure is the pressure required to prevent the flow of water across a semi permeable membrane. So for example we have a cell here and here is the extra cellular fluid. Normally when we are not dehydrated the water levels on the inside and outside of the cell are approximately the same. However, when we are dehydrated, there's less water meaning that there's more salt on the outside of the cell. Since salt attracts water, it's going to make water want to leave the cell and go outside to remain balanced. So when we are dehydrated, water wants to go out of the cell. According to the definition of osmotic pressure, this increases the osmotic pressure on the outside of the cell because water wants to leave and the osmotic pressure is the pressure required to prevent movement across the membrane. So to recap, when we are dehydrated, we have less water on the outside of the cells which causes an increase in salt which increases the osmotic pressure outside of the cell. I'm Michael Maidaa and this is what happens to the osmotic pressure on the outside of the cell during dehydration.

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