P. 78 - Transport.

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Presentation transcript:

p. 78 - Transport

What is the other name for the Cell Membrane? Fluid Mosaic Model

Concentration Gradient The difference in concentration of a dissolved substance (solute) in two solutions separated by a membrane

Terms You Need To Understand Simple Diffusion Molecules spread from high concentration to low concentration Facilitated Diffusion Diffusion with help of proteins Osmosis Diffusion of water

Passive Transport Does osmosis or diffusion require energy? No, molecules move down, or with the concentration gradient = passive transport!!

Facilitated Diffusion Molecules move down (or with) a concentration gradient with the help of special proteins.

Active Transport Requires ATP Moves against the concentration gradient.

Active Transport Example: Sodium-Potassium (Na-K) Pump

Endocytosis Transporting material into a cell by the in-folding of the cell membrane  this process makes a vesicle!

2 Types of Endocytosis Phagocytosis- Solid particles are ingested into the cell. Pinocytosis – liquids taken into the cell.

Exocytosis Moves materials out of the cell