The membrane potential for the cell pictured above

51) The membrane potential for the cell pictured above suddenly changes to -70 mV. This
potential could be generated when,
a) Vm = E
Cl
b) P
Na
> P
K
c) P
K
>> P
Cl
d) Vm = E
X
e) P
Cl
>> P
K
52) An experiment is performed where the above cell is treated with a drug. A voltage
clamp of the cell showed that the conductance for C1 and K+, in the presence of the
drug, was the same (10 x 106 Siemans). The value of the new membrane potential
produced was:
53) The treatment of a cell membrane with a neurotransmitter results in a rapid
conductance change and a depolarization. The channel involved in this process is
most likely a
54) Select the FALSE statement about the Na/K pump.

55) Which ionic channel would produce the greatest amount of membrane depolarization
when it is opened by a neurotransmitter?
a) A channel specifically permeable to Ca2.
b) A channel equally permeable to K and Na.
c) A channel specifically permeable to K.
d) A channel equally permeable to K, Nat, and Ca2.
e) A channel specifically permeable to Na.
56) The relationship between membrane potential and the log of the external
concentration of K ion was plotted for an unknown cell. When the slope of this curve
was found, it had a value of about 50. This most likely means that