The table below shows the current recorded from patch clamp experiments on potassium channels in cultured rabbit lacrimal gland cells at different stimulating membrane potentials.
|
Current (pA)
|
Membrane potentials (mV)
|
|
1.9
|
60
|
|
0.95
|
50
|
|
0.05
|
40
|
|
-0.9
|
30
|
|
-1.85
|
20
|
|
-2.8
|
10
|
|
-3.8
|
0
|
|
-4.8
|
-10
|
|
-5.7
|
-20
|
|
-6.65
|
-30
|
|
-7.6
|
-40
|
|
-8.6
|
-50
|
1) Draw an I - V curve.
2) Calculate the reversal potential.
3) Calculate the conductance of this ion channel.