If concentration of sodium and potassium ions were at the following concentrations inside and outside a cell, how could the two molecules enter the cell? Molecules | Concentration inside the Cell | Concentration outside the Cell Sodium ion (Na+) | 10 mM | 150 mM Potassium ion (K+) | 140 mM | 5 mM Both would diffuse through the membrane into the cell without going through protein channels Sodium ions could enter by facilitated diffusion while the potassium ions would need active transport to enter the cell Potassium ions could enter by facilitated diffusion while the sodium ions would need active transport to enter the cell Both would enter by facilitated diffusion through protein channels Both would require active transport in order to enter the cell
Added by Michael M.
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Step 1: Facilitated diffusion is a passive movement of molecules or ions across the plasma membrane through protein channels. Show more…
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Sodium-potassium pumps maintain the electrical gradient of neuron cells. Each use of the pump requires ATP to move 2 potassium ions into the cell and 3 sodium out of the cell. This is an example of: Osmosis Passive transport Active transport Facilitated diffusion Simple diffusion
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In the majority of cells, resting membrane potentials are closer to the equilibrium potential of potassium (-90 mV) than for sodium (+ 60 mV). This is because none of the other answers. cells are equally permeable to sodium and Chloride, and each time a sodium ion enters a cell, its depolarizing influence is negated by a Chloride ion. cells attract potassium better than sodium, so they maintain potassium closer to its equilibrium potential. VeqK+ is much lower than VeqNa+, and chemical systems are most stable at lower energy states. cell membranes are more permeable to K+ than to Na+, so a greater number of pathways are available for K+ to move towards its equilibrium distribution than are available for Na+ to do the same thing.
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Which of the following help to set the resting potential of a neuron? (Select all that apply) The permeability of the membrane to potassium ions. The activity of the sodium/potassium pump. The concentration of potassium ions inside and outside the cell. The concentration of sodium ions inside and outside the cell. The permeability of the membrane to sodium ions.
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