Unit 3: Cells Cell Transport.

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Presentation transcript:

Unit 3: Cells Cell Transport

The Goal of cell transport Homeostasis Stable internal conditions* * Such as temperature and water

Passive Transport Definition Types of Passive Transport Movement across a cell membrane with NO energy Goes from high to low concentration Diffusion Osmosis Facilitated channels Ion channels

Passive Transport: Diffusion Definition Movement from an high concentration to an area of low concentration

Passive Transport: Osmosis Definition Process of WATER moving from high to low concentration Hypotonic osmosis: water moves INTO the cell and it swells. Hypertonic osmosis: water moves OUT off a cell. The cell shrinks. Isotonic osmosis: solution and cell are both at homeostasis.

Passive Transport: Facilitated Diffusion Definition Diffusion with the help of a busser protein Busser protein

Passive Transport: Ion Channel Definition Passageway in a membrane for ions* to pass through Ion = any atom with a charge (+ or -) Example: sodium (Na + or potassium K+)

Active Transport Definition Types of Active Transport Substances moving across the cell membrane with energy Goes from low to high concentration Cell membrane pump Endocytosis Exocytosis

Active Transport: Cell-Membrane Pump Definition Bussers pump molecules across the membrane from LOW to HIGH

Active Transport: Endocytosis Definition 2 types The process in which cells ingest (take in) molecules Pinocytosis – cells take in liquids Endocytosis – cells take in solids

Active Transport: Exocytosis Definition Cells expel (get rid of) molecules