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Unit 3: Cells Cell Transport.

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Presentation on theme: "Unit 3: Cells Cell Transport."— Presentation transcript:

1 Unit 3: Cells Cell Transport


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

4 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

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

6 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.

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

8 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+)

9 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

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

11 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

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

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