Movement of substances into and out of cells
- Created by: Linnea Rajal
- Created on: 06-03-13 18:13
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- Movement of substances into and out of cells
- Diffusion
- Is the spreading out of the particles of any substance in a solution, or particles of a gas
- Resulting is a net movement from an area of higher conc to an area of lower conc
- Greater difference in conc, faster the rate of diffusion
- Dissolved substances can move into and out of a cell by diffusion
- Oxygen required for respiration passes through cell membranes by diffusion
- With conc gradient and require no energy
- Is the spreading out of the particles of any substance in a solution, or particles of a gas
- Osmosis
- 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 concs of solutions inside and outside cell causes water to move into or out of cell by osmosis
- With conc gradient and require no energy
- Hypotonic solution- solution which has lower conc of solutes than cytoplasm of cell
- Hypertonic solution- solution which has higher conc of solutes than inside cell
- Isotonic- a solution that has the same conc of solutes as inside of cell
- Active transport
- Substances sometimes absorb against conc gradient - requires uses of energy from respiration
- Enables plants to absorb ions from very dilute solutions e.g. root hair cell
- Similarly, sugar may be absorbed from low concs in intestine and from low cons in kidney tubules
- Diffusion
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