Diffusion, Osmosis, & Active Transport

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

Passive Transport Requires no energyRequires no energy Flows “downhill” from an area of higher concentration to an area of lower concentration.

Diffusion 1. Diffusion requires no energy 2. It is the movement of molecules from a high concentration to a low concentration

Diffusion

Diffusion

Facilitated Diffusion Facilitated Diffusion uses a membrane protein to get molecules across the membraneFacilitated Diffusion uses a membrane protein to get molecules across the membrane It is still diffusion so it requires no energy and moves from high to low concentrationIt is still diffusion so it requires no energy and moves from high to low concentration

Facilitated Diffusion

Osmosis Osmosis is the movement of water across a semi permeable membraneOsmosis is the movement of water across a semi permeable membrane Osmosis requires no energyOsmosis requires no energy

Osmosis

Osmosis

Osmosis

Hypertonic Solution

Hypotonic Solution

Types of Transport

Active Transport Active transport requires energyActive transport requires energy Moves molecules from low concentration to high concentrationMoves molecules from low concentration to high concentration Requires use of special membrane proteinsRequires use of special membrane proteins

Active Transport Active transport also includes endocytosis and exocytosisActive transport also includes endocytosis and exocytosis Endocytosis is when molecules are brought in to the cell through movement of the membraneEndocytosis is when molecules are brought in to the cell through movement of the membrane Exocytosis is when molecules are pushed out of the cell due to movement of the membraneExocytosis is when molecules are pushed out of the cell due to movement of the membrane

Active Transport

Na-K Ion Pump (Active)

Endocytosis

Endocytosis

Endocytosis - Pinocytosis

Endo & Exo Cytosis

Exocytosis

Exocytosis

Exocytosis