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Diff: 4 Page Ref: 975) If the membrane potential is equal to the equilibrium potential for an ion, individual ions will not move across the membrane in either direction.Diff: 6 Page Ref: 996) Ions move passively down their electrochemical gradient.Diff: 4 Page Ref: 997) The rate at which molecules are actively transported across a membrane is determined by the rate of transport of individual pumps and the number of pumps in the membrane.Diff: 4 Page Ref: 1118) If the direction of the net flux of an ion is against its electrochemical gradient, then that transport is passive.Diff: 4 Page Ref: 1019) The driving force for simple diffusion is the electrochemical gradient.Diff: 4 Page Ref: 10310) Facilitated diffusion is a form of mediated transport.Diff: 3 Page Ref: 10611) In facilitated diffusion, the carrier protein has equal affinity for the molecule being transported on both sides of the membrane.Diff: 4 Page Ref: 10612) Ions can always move through the ion channels present in the plasma membrane as long as there is an electrochemical gradient to drive the movement.Diff: 5 Page Ref: 10813) Primary active transporters are similar to carriers, with the exception that they are able to useenergy to move ions against their electrochemical gradient.Diff: 5 Page Ref: 10820
14) Pumps can move ions in either direction, as long as it is against that ion's electrochemical gradient.Diff: 6 Page Ref: 10815) A cotransporter uses an ion's concentration gradient to move a second ion or molecule in the same direction as the first.Diff: 4 Page Ref: 11016) The movement of water across a membrane is always a passive process.Diff: 4 Page Ref: 11217) Large differences in water concentration are required to drive water across a membrane.Diff: 4 Page Ref: 11318) At the resting membrane potential, a cell is at equilibrium.Diff: 4 Page Ref: 11119) At the resting membrane potential, leakage of sodium ions into the cell and potassium ions out of the cell is balanced by the action of the Na+/K+pump.Diff: 4 Page Ref: 11120) Osmosis occurs through aquaporins.Diff: 4 Page Ref: 10821) Phagosomes are formed following receptor-mediated endocytosis.Diff: 3 Page Ref: 118
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Atom, Electric charge, Cell Membrane Transport, Ion