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Questions and Answers
What is the role of the Nernst equation in determining membrane potential?
What is the role of the Nernst equation in determining membrane potential?
It tells us that EK is -80 mV when K+ is concentrated twentyfold on the inside of a cell.
Explain how ionic concentration gradients are established in a neuronal membrane.
Explain how ionic concentration gradients are established in a neuronal membrane.
Ionic concentration gradients are established by the actions of ion pumps, particularly the sodium-potassium pump and the calcium pump.
Which ion is more concentrated on the inside of a cell, potassium (K+) or sodium (Na+)?
Which ion is more concentrated on the inside of a cell, potassium (K+) or sodium (Na+)?
Potassium (K+) is more concentrated on the inside of a cell.
What is the ratio of K+ concentration inside to outside the cell?
What is the ratio of K+ concentration inside to outside the cell?
How does the sodium-potassium pump function in maintaining ionic balance?
How does the sodium-potassium pump function in maintaining ionic balance?
What is the membrane potential achieved for Na+ at body temperature?
What is the membrane potential achieved for Na+ at body temperature?
Explain the significance of the calcium pump in cellular neurophysiology.
Explain the significance of the calcium pump in cellular neurophysiology.
What is the ratio of Cl- concentration outside to inside the cell?
What is the ratio of Cl- concentration outside to inside the cell?
What is the membrane potential achieved for Cl- at body temperature?
What is the membrane potential achieved for Cl- at body temperature?
How does the sodium-potassium pump utilize the energy released from ATP breakdown?
How does the sodium-potassium pump utilize the energy released from ATP breakdown?
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