Osmosis- Unit3 0.0 / 5 ? BiologyLife ProcessesGCSEAQA Created by: chloeewebsterrCreated on: 14-02-16 21:24 What is osmosis a special case of? Diffusion 1 of 12 What is osmosis? Movement of water molecules across a partially permeable membrane from a region of high concentration to a region of low concentration 2 of 12 State what a partially permeable membrane is? One with very small holes in it- only tiny molecules (such as water) can pass through them and bigger molecules (such as sucrose) can't 3 of 12 Why do water molecules pass both ways through the membrane during osmosis? Water molecules moves about randomly all the time 4 of 12 How come there are more water molecules on one side than the other? There's a net flow of water into the region with fewer water molecules, such as into the stronger sugar solution 5 of 12 The strong sugar solution gets more what? Dilute- water acts like it's trying to even up the concentration either side of the membrane 6 of 12 Water moves into and out of cells by what? Osmosis 7 of 12 What surrounds the cells in the body? Tissue fluid-it is basically just water with oxygen, glucose and stuff dissolved in it 8 of 12 Why is tissue fluid squeezed out of the blood capillaries for? To supply the cells with everything they need 9 of 12 What does it mean if the tissue fluid will usually have a different concentration to the fluid inside a cell? That water will either move into the cell from the tissue fluid, or out of the cell, by osmosis 10 of 12 What happens to the solution if the cell has lots of water? It will become more dilute, and more water will be drawn out of the cell and into the fluid outside by osmosis 11 of 12 What object can you use for an experiment to show how osmosis works Potato 12 of 12
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