Notes for D2.3.3 Water movement by osmosis into or out of cells - IB | RevisionDojo
D2.3.3 Water movement by osmosis into or out of cells Notes
Water Movement by Osmosis into or out of Cells
If you placed a wet sponge on a dry table, water would move out of the sponge onto the table.
But if you place it in a bowl of water, the sponge would absorb more water and swell.
This movement of water, depending on the surroundings, is exactly how osmosis works
Definition
Osmosis
Osmosis is the passive movement of water molecules across a semi-permeable membrane from a region of lower solute concentration (hypotonic) to a region of higher solute concentration (hypertonic).
Osmosis Works For Three Main Reasons
Osmosis in action
Semi-Permeable Membrane: Allows water to pass but restricts solutes.
Concentration Gradient: Water moves to balance solute concentrations on both sides of the membrane.
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Questions
Recap questions
1 of 5
Question 1
Recap question
When a red blood cell is placed in a solution with lower solute concentration than inside the cell, what happens and why?
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Note
Water movement is crucial for cell survival, nutrient uptake, and maintaining cell structure. Osmosis is a specific type of water movement that occurs across cell membranes.
Water is essential for many cellular processes, including chemical reactions and maintaining cell shape.
Cells are surrounded by a semi-permeable membrane that allows water to pass through but restricts larger molecules.
The movement of water is influenced by the concentration of solutes (like salts) inside and outside the cell.
AnalogyThink of a cell like a water balloon with tiny holes that only let water through. The water inside and outside the balloon tries to balance out.
DefinitionOsmosisThe passive movement of water molecules through a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
