بسم الله الرحمن الرحيم. TRANSPORT ACROSS CELL MEMBRANE. Prepared by Dr.Mohammed Sharique Ahmed Quadri Assistant prof. Physiology Al Maarefa College. Objectives . Define permeability and list factors influencing permeability .
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TRANSPORT ACROSS CELL MEMBRANE
Polar heads love water & dissolve.
Non-polar tails hide from water.
Carbohydrate cell markers
1. Lipid soluble particles e.g. O2, CO2, fatty acid.
2. Size of the particle—less than 0.8nm.
(diffusus means “to spread out”)
(High to Low)
factors affecting net rate of diffusion are
1. Chemical gradient – concentration of ion
2. Electrical gradient – charge of ion
3. Electrochemical gradient – Both Electrical charge and concentration gradient
2. Facilitated diffusion: diffusion of specific particles through transport proteins found in the membrane
Diffusion (Lipid Bilayer)
Facilitated diffusion(Channel Protein)
Cellular Transport From a-
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-many channels open n closed by gates
The force that would have to be exerted to prevent osmosis.
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): Cell Swells and bursts open (cytolysis)!
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)!
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 same size! (Dynamic Equilibrium)