Membrane Physiology and Neuronal Excitability NOT FINISHED

Question 1

What are the relative concentrations of each of the following ions intracellularly and extracellularly?
K+
Na+
Ca2+
Cl-

Answer 1

K+: outside low, inside high
Na+: outside high, inside low
Ca2+: outside lowish, inside very low
Cl-: outside high, inside lowish

Question 2

What is the Em in neurones?

Answer 2

the resting potential of neurones is -65mV

Question 3

What are the 2 factors influencing ion movement across membranes?

Answer 3

chemical gradient

electrical force