Cell Transport.

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Presentation transcript:

Cell Transport

All cell transportation is done by the cell membrane Our cells use two types of transportation Active (requires energy) Passive (doesn’t require energy)

Passive Transport 2 types Diffusion Osmosis

Diffusion Movement of particles from a solution of high concentration to a solution of low concentration Caused by Brownian motion When particles bump into each other This transport continues until the two solutions reach equilibrium Balances substances

Facilitated Diffusion Uses channel proteins Ion channels Act as tunnels that allow particles to ‘fall’ into the cytoplasm of the cell Temperature and concentration gradient change the rate of diffusion Hotter = better Large difference = faster

Osmosis Special type of diffusion DEFINITION = diffusion (movement) of water across a selectively permeable membrane Water will move from a high concentration to a low concentration to reach equilibrium

Cell Concentration How much solute (part dissolved) is in a solvent (liquid dissolving) Type of concentrations Hypertonic = solution has less water Hypotonic = solution has more water Isotonic = equal on both sides

All cell transportation is done by the cell membrane Our cells use two types of transportation Active (requires energy) Passive (doesn’t require energy)

Active Transport Uses energy Particles move from an area of low concentration to an area of high concentration

3 types Carrier Protein Pumps Proteins are in the cell membrane Energy changes shape of the protein so substances can pass

Endocytosis Taking bulky material into the cell Cell membrane folds in around particle ‘cell eating’ = phagocytosis ‘cell drinking’ = pinocytosis

exocytosis Forces material out of the cell Allows wastes to be released