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Membrane Potential - Coggle Diagram
Membrane Potential
Membrane Assymetry
Inner Layer
Phosphotadylserine, Phosphidaylinositol, Phosphotadylethanolamine
Phosphotadylethanolamine has a conical shape that can help make the membrane bend which required (for vesicle formation etc.)
Phosphotidaylserine and Phosphitadylinositol are both negatively charged, and then when in higher concentration in teh center, they can recruit proteins from teh cell that are required, or even some positively charge signal transduction proteins.
Phosphotadylserine can also cause macrophage cells to intiaite apopostis (cell death), when it shows up in the outer layer, and thus it is a measure of cell viability.
Outer Layer
Sphingomyeline, phosphidatylcholine, glycolipids (glycosphingolipid), glycoprotein
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Selective permeability
The plasma membrane is selectively permeabile, which means that it controls what enters the cell and what exits.
The bilayer of phospholipids makes it so that small hydrophobic particles can simply diffuse through the membrane.
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Facilitated Transport
Permease
Permease carriers undergo a conformational change upon the binding of molecules to their active sites.
Porions
Porions are like barrels with larger diameters than ion channels, and shape specific not ion specific.
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Ion-channels
Ligand-gated
Binding by specific molecules opens this channel, which is specific to ions rather than just shape
Voltage-gated
The gates on this channel are opened by certain differences in charge across the membrane, the membrane potential. Channels can go either way.
Leak Channel
Ion channels with no gates that constantly allow specific ions to folllow their concentration gradient.
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Simple diffusion occurs along the concentration gradient, which is the measure quantity difference of ions or molecules across the membrane. Following the concentration gradient means to go from areas of high concentration to areas of low concentration
Electrochemical gradient is the combination of the two, and following it means followng the two, however the electrical gradient does dominate.
The electrical gradient is for charge.particals, and it measures the diffference in charge across the membrane. To follow the chemcial gradient is to go to the side of opposite charge (as opposites attract)
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Passive transport
This is transport that requires no energy input to occur,