Movement across the Plasma Membrane

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Presentation transcript:

Movement across the Plasma Membrane

Passive Transport Movement of molecules across a semi-permeable membrane with a concentration gradient no energy required 2 types Diffusion Facilitated Diffusion

Diffusion- net movement of molecules across a semi-permeable membrane

Diffusion Solute molecules moving from an area of high concentration to an area of low concentration (water) Equilibrium is reached when there is an even distribution of solute molecules

Facilitated Diffusion Movement of molecules across a semi-permeable membrane with a protein

Osmosis Diffusion of water through a semi-permeable membrane Moves from High [water] to low [water]

Osmosis in Living Cells 3 Types Isotonic Hypertonic Hypotonic

Effect of Water on RBC

Electron Micrograph of Osmosis in Red Blood Cells Isotonic Hypotonic Hypertonic Electron Micrograph of Osmosis in Red Blood Cells

Osmosis in Plant Cells Hypertonic Hypotonic

Active Transport Movement of molecules across a semi-permeable membrane against a concentration gradient with a protein Requires Energy (ATP)

Lets Review:

Does it move with or against the concentration gradient? What is…. Diffusion? Does it move with or against the concentration gradient? Facilitated Diffusion? What does it require that is different than regular diffusion?