Cell Transport
- Created by: Amy Kirkness
- Created on: 10-11-12 06:04
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- Cell Transport
- Passive Processes
- Diffusion
- the movement of particles from an area of high concentration to an area of low concentraion
- Facilitated Diffusion
- using proteins to assist large substancesto diffuse through the cell membrane
- Carrier Proteins
- oxygen, carbon dioxide, fatty acids
- Protein Channels
- sodium, potassium, calcium, chloride ions
- Osmosis
- the movement of a solvent (ie. water molecules) from a region of high concentration (low solute concentration) to a region of low concentration (high solute concentration) through a partially permeable membrane
- hypertonic: a greater solute concentration
- hypotonic: a lower solute concentration
- isotonic: an equal solute concentration
- Diffusion
- Active Processes (require energy)
- the movement of molecules against a concentration gradient
- requires energy from respiration
- transfer of amino acids
- pumping sodium ions out of cells
- Vesicular Transport
- Endocytosis
- the cell membrane surrounds some extracellular material with the fold of the cell membrane
- phagocytosis: cell eating (taking in solids)
- pinocytosis: cell drinking(taking in liquids)
- Exocytosis
- materials enclosed in vesicles are expelled from the cell membrane
- eg. secretes, enzymes, hormones
- Endocytosis
- Passive Processes
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