TYPES OF TRANSPORT.

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Presentation transcript:

TYPES OF TRANSPORT

Molecular Movement Molecules move RANDOMLY!

Diffusion …is the random movement of particles from an area of high concentration to low concentration.

Diffusion in the air

Diffusion in the air Low concentration High concentration

Diffusion in the air

Water can also diffuse Salt on a slug

Water can also diffuse Pruney fingers WATER

Osmosis The diffusion of water across a semi-permeable membrane. Semi-permeable = some things can pass, others cannot

Osmosis The diffusion of water across a semi-permeable membrane. Semi-permeable = some things can pass, others cannot CELL MEMBRANES ARE SEMI-PERMEABLE!

Passive transport Molecules can move into or out of a cell without energy input from the cell. Ex: diffusion and osmosis, facilitated diffusion

Facilitated Diffusion Another type of passive transport Proteins in the cell membrane help to move molecules into/out of the cell

Active transport Energy input from the cell is required for a membrane protein to help molecules to move into/out of the cell Energy provided from ATP molecules Active transport usually required to make molecules go against their concentration gradient