Topic 1.2 - The Movement of Substances into and out of Cells
- Created by: Alice Cullen
- Created on: 28-12-16 10:24
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- Diffusion is the spreading of the particles of any substance in solution or particles of a gas.
- This results in the net movement from a region of higher concentration to a region with lower concentration.
- The greater the difference in concentration the faster the rate of diffusion
- Dissolved substances can move into and out of cells by diffusion
- Oxygen needed in respiration passes through cell membranes by diffusion
- Osmosis is the diffusion of water from a dilute to a more concentrated solution through a partially permeable membrane that allows the passage of water molecules
- Differences in the concentrations of the solutions inside and outside of a cell can cause water to move into or out of the cells by osmosis
- An isotonic solution is one in which the concentration of solutes is the same both inside and outside of the cell.
- A hypotonic solution is one in which the concentration of solutes is greater…
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