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Diffusion/Osmosis

Diffusion/Osmosis Biology leaving cert

QuestionAnswer
What is a Semi-permeable Membrane? A Membrane that only allows certain molecules through it
What are some examples of Semi-permeable Membranes? -Cellophane -Visking Tubing -Dialysis Tubes
What do Semi-permeable Membranes usually let through them? Water (H2O), Carbon Dioxide (CO2) and Oxygen (O2).
What molecules do the specialised semi-permeable membranes, Cell Membrane, let through? Glucose.
What is Diffusion? The movement of a gas or liquid from a high to low concentration. Ie gas diffusion of CO2 from the blood to lungs and of O2 from the lungs to the blood.
What is Osmosis? The movement of water molecules across a semi-permeable Membrane from low to high concentration.
Osmosis in Animals The solution concentration will be balanced, if the external environment overly/under concentrated the cytoplasm will become less/more concentrated.
Osmosis in Plants The Cell wall is fully permeable, water in the vacuole causes the cell wall to be turgid.
Osmosis in food preservation Salty foods take longer to go off because microorganisms die as a result of osmosis. Marmalade and jams dehydrate microorganisms, preventing growth.
Created by: AW117
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