exercise_nervous_I_topic_4

exercise_nervous_I_topic_4 - , the gradients mentioned in...

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The Nervous System: Membrane Potential 1. Record the intracellular and extracellular concentrations of the following ions (mM/L): Intracellular Extracellular Sodium (Na + ) Potassium (K + ) Chloride (Cl ) 2. Excitable cells, like neurons, are more permeable to ___________ than to ___________. 3. How would the following alterations affect the membrane permeability to K + ? Use arrows to indicate the change in permeability. a. An increase in the number of passive K + channels ___________ b. Opening of voltage-gated K + channels ___________ c. Closing of voltage-gated K + channels ___________ 4. a. What acts as a chemical force that pushes K + out of the cell? ___________ b. What force tends to pull K + back into the cell? _____________________ 5. When the two forces listed above are equal and opposite in a cell permeable only to K + , this is called the _________________________ potential for K + which is ___________ mV. 6. In an excitable cell, also permeable to Na + and Cl
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Unformatted text preview: , the gradients mentioned in question 4 would both tend to move Na + ___________ the cell. 7. Would the gradients in question 4 promote or oppose the movement of Cl into the cell? a. b. 8. Since the neuron is permeable to Na + as well as K + , the resting membrane potential is not equal to the equilibrium potential for K + , instead it is ___________ mV. 9. What compensates for the movement (leakage) of Na + and K + ions? ______________ 10. What will happen to the resting membrane potential of an excitable cell if: (Write pos or neg to indicate which way the membrane potential would change.) a . extracellular fluid concentration of K + ___________ b . extracellular fluid concentration of K + ___________ c . extracellular fluid concentration of Na + ___________ d . number of passive Na + channels ___________ e. open voltage-gated K + channels ___________ f. open voltage-gated Na + channels ___________...
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exercise_nervous_I_topic_4 - , the gradients mentioned in...

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