Reference no: EM1389632

The single channel current for a sodium channel is 6.4 pA, how many ions flow through the channel in 0.5 msec? Faraday constant = 96500 coulombs/mol
A) 10000.
B) 20000.
C) 30000.
D) 40000
E) 50000
Using the Nernst equation, if there was a change in the concentration of potassium ions outside the cell from 4 mM to14 mM without any change in the internal concentration of potassium ions would you expect that the equilibriumpotential for potassium ions
A) to be unchanged.
B) to become more positive.
C) to become more negative.
D) to change only slightly but be very close to the initial equilibrium potential for potassium
E) to be independent of voltage- gating
Which of the following substances inactivates acetylcholinesterase for weeks making it a very lethal poison?
A) Botulimium toxin
B) Phostigmine.
C) Neostigmine
D) Clostridium toxin.
Which of the following statements is correct about the Nasal potential difference test performed on a CF patient
A) The potential difference is high prior to amiloride perfusion and following low chloride perfusion shows no change in potential difference
B) The potential difference is low prior to amiloride perfusion and following low chloride perfusion shows a sharp rise in potential difference
C) The potential difference is low prior to amiloride perfusion and following low chloride perfusion shows no change in potential difference
D) The potential difference is low prior to amiloride perfusion and following low chloride perfusion shows a sharp fall in potential difference
E) The potential difference is high prior to amiloride perfusion and following low chloride perfusion shows a sharp decrease in potential difference
Myopotentials which cause pacemakers to function inappropriately are due to
A) Exit block
B) a broken lead
C) under sensing by the pacemaker
D) over sensing by the pacemaker
E) lead displacement
The Shaker gene codes for a ____________ ion channel which is responsible for the _________ of the neuron
A)sodium, depolarization.
B) sodium, repolarization.
C) potassium, depolarization.
D) potassium, repolarization.