WorksheetsAction Potential in Neuron
Total questions: 9
Worksheet time: 7mins
A typical neuron has a resting membrane potential of about:
+70 mV
+70 V
−70 mV
−70 V
All of the above are observed at rest
The following ion(s) is/are involved in the neuronal action potential:
Sodium (Na+) Potassium (K+)
Calcium (Ca2+)
Chloride (Cl−)
All of the above
At the peak of the action potential, the membrane potential is:
exactly at the Na+ equilibrium potential (VNa)
close to but more positive than the Na+ equilibrium potential (VNa)
close to but less positive than the Na+ equilibrium potential (VNa)
exactly at 0 mV
the same as the resting membrane potential (Vrest)
At what membrane voltage do neuronal voltage-gated Na+ channels become activated?
−70
−50
0 mV
+50 mV
None of the above
At what membrane voltage do neuronal voltage-gated K+ channels become activated?
−70
−50
0 mV
+50 mV
None of the above
The spike phase of the neuronal action potential is due to:
the opening of voltage-gated Na+ channels
the opening of voltage-gated K+ channels
the closure of resting K+ channels
the opening of voltage-gated Cl− channels
None of the above
The hyperpolarization phase of the action potential is due to:
the opening of voltage-gated Cl− channels
the prolonged opening of voltage-gated K+ channels
the closure of resting Na+ channels
due to the closure of Cl− channels
None of the above
Upon opening, voltage-gated K+ channels of neurons enter an inactivate state in a manner similar to voltage-gated Na+ channels of neurons.
True
False
In the nervous system, the strength of the stimulus is coded into:
The frequency of action potentials generated
The amplitude of action potentials generated
Both the frequency and amplitude of action potentials generated
