P.mauri membrane transport

Cell Membrane and Transport Prof. Patrizia Mauri Liceo Rodari – Prato - Italy

About Cell Membrane ,[object Object],[object Object],[object Object]

Cell Membranes from Opposing Neurons } cell membrane 7nm wide Cell membrane { Nerve cell Nerve cell Gap between cells

[object Object],[object Object],[object Object],[object Object],Cell Membranes Structure Phospholipid Lipid Bilayer

Proteins Membrane movement animation Polar heads love water & dissolve. Non-polar tails hide from water . Carbohydrate cell markers Fluid Mosaic Model of the cell membrane

[object Object],[object Object],[object Object],About Cell Membrane

Outside of cell Inside of cell (cytoplasm ) Lipid Bilayer Proteins Transport Protein Phospholipids Carbohydrate chains Structure of the Cell Membrane Go to Section: Animations of membrane structure

Types of Cellular Transport ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],high low This is gonna be hard work!! high low Weeee!!!

Types of Passive Transport ,[object Object],[object Object],[object Object]

Diffusion ,[object Object],[object Object],[object Object],[object Object]

Diffusion ,[object Object],[object Object],[object Object],[object Object],http://bio.winona.edu/berg/Free.htm Simple Diffusion Animation

[object Object],[object Object],[object Object]

So ....... how can you describe : 1. The O 2 flow in a breathing cell? 2. The CO 2 f low in a breathing cell? 3. The O 2 flow in a photosynthesizing cell? 4. The CO 2 flow in a photosynthesizing cell?

[object Object],[object Object],Facilitated diffusion (Channel Protein) Diffusion (Lipid Bilayer ) Facilitated Diffusion Carrier Protein A B

High Concentration Low Concentration Cell Membrane Glucose molecules Protein channel Passive Transport: Facilitated Diffusion Go to Section: Transport Protein Through Cellular Transport High Low ,[object Object]

[object Object],[object Object],[object Object],[object Object],Osmosis animation Osmosis

Now we are going to analyze the effects of osmosis on cells and organisms .........

We can have three different types of solution outside the cell: Hypotonic = at lower concentration Hypertonic = at higher concentration Isotonic = at the same concentration

Hypotonic Solution Hypotonic : The solution has a lower concentration of solutes and a higher concentration of water than inside the cell. (Low solute; High water) Result : Water moves from the solution to inside the cell: the cell swells and bursts open (Cytolysis)! ,[object Object]

Hypertonic Solution Hypertonic : The solution has a higher concentration of solutes and a lower concentration of water than inside the cell. (High solute; Low water) Result : Water moves from inside the cell into the solution: Cell shrinks (Plasmolysis)! ,[object Object],shrinks

Isotonic Solution Isotonic : The concentration of solutes in the solution is equal to the concentration of solutes inside the cell . Result : Water moves equally in both directions and the cell remains of the same size! (Dynamic Equilibrium) ,[object Object]

What type of solutions are these? A C B Hypertonic Isotonic Hypotonic

How Organisms Deal with Osmotic Pressure ,[object Object],[object Object],[object Object],[object Object]

Active Transport ,[object Object],[object Object],[object Object],[object Object]

Types of Active Transport ,[object Object],[object Object],[object Object],[object Object],Sodium Potassium Pumps (Active Transport using proteins) Protein changes shape to move molecules: this requires energy ! ‪http :// medicinapertutti.altervista.org /argomento/ pompa-sodio-potassio

Types of Active Transport ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Types of Active Transport ,[object Object],[object Object],[object Object],[object Object],Endocytosis & Exocytosis animations

P.mauri membrane transport

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