Describe extracellular k+ concentration

Question

Problem:

Question 1: How does the extracellular K+ concentration affect resting membrane potential?

Question 2: A large quanity (>100nM) of K+ are added to the extracellular fluid of a neuron. The neuron is then stimulated to generate an action potential. During this action potential, how will the addition of K+ to the extracellular fluid influence the repolarization and afterhyperpolarization phases of the action potential?

Question 3: Following this action potential, how will the neuron's resting membrane potential compare to its resting membrane potential proir to the addition of K+?

Question 4: How will the addition of K+ to the extracellular fluid affect the neurson's overall function? WHY?

Question 5: How does the extracellular Na+ concentration affect resting membrane potential?

Question 6: Why does the amplitude of the compund action potential increase as stimulus strength increases?

Question 7: Why doesn't the amplitude of the compound action potential continue to increase with very large stimulus strengths?

I dont need long explanation. Just few sentences of expanation.