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Why increasing extracellular potassium causes the membrane potential to change to a less negative value. how well does the results compare with your prediction?
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What are the positions of ions at resting potential?
Sodium is mostly concentrated in the extracellular space, and potassium in the cytoplasm.
What effect will Raising the potassium ion concentration in the extracellular fluid surrounding a nerve cell have?
Both hyperpolarize it and decrease the magnitude of the potassium equilibrium potential.
Why does increasing extracellular potassium ion cause membrane potential to change to a less negative value?
the membrane potential became less negative because less potassium ions went out of the cell (since the extra cellular space has higher concentration of potassium, and potassium goes down its concentration gradient, from high concentration to low concentration). since less potassium (K+)which is positive, left the cell more it became more positive (less negative)
What does a ion exchange pump transport at the normal resting potential of a typical neuron?
3 intracellular sodium ions for 2 extracellular potassium ions
The sodium-potassium pump releases?
Hmm. Maybe Sodium and Potassium? Or another answer is it transfers Na+ (sodium) out of the cell and K+ potassium into the cell.
The role of the sodium potassium pump in maintaining a cells resting membrane potential?
The relative concentration of sodium (Na+) and potassium (K+) in the neuron with respect to their concentration in the extracellular space is what causes the electrical potential and the differential concentration is established by a Na-K Atpase which exudes sodium and transports potassium into the neuron.
What happens to the equilibrium potential of sodium as you decrease the extracellular sodium concentration?
The equilibrium potencial of sodium decreases as you decrease its extracellular concentration
What affect does elevated extracellular chloride have on the resting membrane potential of a neuron?
Not much. Changing the extracellular chloride changes the level inside the cell so they will be in equilibrium again. The chloride ion plays little role in resting potential.
Where does prediction cone come from?
The prediction cone, also known as the cone of uncertainty, comes from meteorology and hurricane forecasting. It represents the potential path a hurricane could take while accounting for forecasting errors. The cone widens over time to account for the increasing uncertainty in predicting the exact track of the storm.
Ions used to establish a resting potential?
Potassium and sodium determine the a cell's resting membrane potential. The equilibrium potential (the voltage where no ion would flow) for sodium is about +60 mV while that for potassium is usually around -80 mV, but because the resting cell membrane is approximately 75 times more permeable to potassium than to sodium, the resting potential is closer the the equilibrium potential of potassium. This is because potassium leak channels are always open while sodium come in through voltage gated or ligand gated channels.
Can you make potassium cyanide un poisonous?
No. As long as it remains potassium cyanide, there is fatal potential.
What Hyperpolarizing membrane potential occurs in the postsynaptic membrane of a synapse?
Hyperpolarization means that the membrane potential becames more negative than the resting potential. This means that it is more difficult for an action potential to be triggered at the postsynaptic membrane. This occurs at inhibitory synapses. Hyperpolarization can be achieved by increasing the permeability of the membrane to potassium or chloride ions. If potassium permeability is increased more potassium ions will leave the cell, down their concentration gradient; if chloride permeability increases chloride ions will enter the cell down their concentration gradient. Both movements will make the inside of the cell more negative ie they will cause hyperpolarization.
