Why is the equilibrium potential of a membrane also called reversal potential? 5. (Part 03, medium) 105-Mid
A. Because it reverses the direction of an action potential of the neuronal cell.
Because it transforms a dendritic terminal into an axonal one.
C. Because the ions stop moving at the equilibrium potential.
D. Because the net flux of the ions reverses the direction when the membrane potential changes across the equilibrium potential.
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The derivation of the Nernst equation does not require which of the following knowledge? 4. (Part 02, difficult)105-Mid
A. The energy consumed by an ion pump when transporting ions across the membrane.
Balance between the kinetic energy and electric potential across the membrane.
C. The distribution of kinetic energy of ions.
D. The probability that an ion flows across the membrane.
Which of the following factors does not directly influence whether an ion can pass the membrane or not? 2. (Part 02, medium) 105-Mid
A. The potential difference across the membrane.
B. The kinetic energy of the ion.
C. The genetic profile of the cell.
D. The temperature of the system.
The INa,p model exhibits bistability and hysteresis in response to the external current input. Which of the following statements correctly describes the phenomenon? 47. (Part 15, difficult) 105-Mid
A. This is due to the activation of potassium channels.
B. The membrane potential depends on not only the momentarily current input, but also on its history.
C. The phenomenon has never been observed experimentally.
D. None of above.
A membrane current can be classified into inward and outward directions, and the associated gating mechanism can be classified into activation and inactivation. Accordingly, four current types can be defined. Which of the following statements about the four current types is not correct? 44. (Part 15, difficult)105-Mid
A. The persistent sodium channel corresponds to the inward-activation type.
B. The outward-activation current is a stable current.
C. The inactivation gate of the sodium channel produces an inward-inactivation current.
D. The inward inactivation current is an unstable current
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