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- 1. Multiple Choice
What initially creates a small membrane potential in a neuron?
The action of the sodium-potassium pump
The influx of potassium ions
The movement of sodium ions outside the neuron
The addition of organic anions to the cytoplasm
- 2. Multiple Choice
What is the role of the sodium-potassium pump in neuron function?
It decreases the membrane potential
It makes the neuron membrane impermeable to ions
It balances the concentration of sodium and potassium inside and outside the neuron
It uses ATP to transport sodium and potassium ions across the neuron membrane
- 3. Multiple Choice
Why do the concentrations of potassium and sodium change inside the neuron but not outside?
Because of the action of leak channels
Due to the impermeability of the neuron membrane to these ions
Because the extracellular fluid volume is too large
Due to the equilibrium potential being reached
- 4. Multiple Choice
What happens to potassium ions due to the forces acting on them in a neuron?
They move out of the neuron, making the inside more negative
They are equally distributed inside and outside the neuron
They stop moving across the membrane
They increase the neuron's resting potential
- 5. Multiple Choice
At what membrane potential might potassium reach its equilibrium potential in a typical neuron?
-60 millivolts
-70 millivolts
+50 millivolts
-50 millivolts
- 6. Multiple Choice
What is the equilibrium potential also known as?
Graded potential
Reversal potential
Action potential
Resting potential
- 7. Multiple Choice
Why does the resting membrane potential not settle at the potassium equilibrium potential?
Because of the sodium-potassium pump activity
Due to the equilibrium potential of chloride
Due to the impermeability of the neuron membrane to sodium
Because sodium ions also affect the membrane potential
- 8. Multiple Choice
What is the typical resting potential for a neuron?
+50 millivolts
-60 millivolts
-50 millivolts
-70 millivolts
- 9. Multiple Choice
How does the chloride potassium symporter affect chloride ions?
It balances the chloride ions inside and outside the neuron
It makes the neuron membrane permeable to chloride
It increases the intracellular concentration of chloride
It decreases the intracellular concentration of chloride
- 10. Multiple Choice
What is the main function of the sodium calcium exchanger?
To pump calcium out of the neuron using sodium's energy
To make the neuron membrane permeable to calcium
To decrease the membrane potential
To balance the concentration of sodium and calcium inside the neuron
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