Resting Membrane Potential

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

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

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

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

Tags

NGSS.HS-LS1-3

At what membrane potential might potassium reach its equilibrium potential in a typical neuron?

• -60 millivolts

• -70 millivolts

• +50 millivolts

• -50 millivolts

What is the equilibrium potential also known as?

• Graded potential

• Reversal potential

• Action potential

• Resting potential

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

What is the typical resting potential for a neuron?

• +50 millivolts

• -60 millivolts

• -50 millivolts

• -70 millivolts

Tags

NGSS.HS-PS2-5

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

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

Tags

NGSS.HS-LS1-3