WorksheetsCan you recall these from Nerve II?
Total questions: 10
Worksheet time: 6mins
Which of the following is the ionic basis for the rapid upstroke of action potential?
Rapid Na+ influx
Rapid K+ efflux
Slow Na+ efflux
Slow K+ influx
Which of the following is the approximate threshold potential for a typical neuron?
-90 mV
-70 mV
-55 mV
-30 mV
Which of the following is the basis for absolute refractory period of an action potential?
Membrane potential is higher than threshold potential
Membrane potential is lower than resting membrane potential
Voltage-gated K+ channels are closed
Ligand-gated channels are closed
Which of the following is a characteristic of action potential?
The magnitude diminishes with the distance of propagation
The depolarisation phase is dependent on net movement of Na+ and K+
The direction of potential change always begins with depolarisation
The duration of potential is dependent on the stimulus
Which of the following describes saltatory conduction?
It occurs in unmyelinated neurons
The voltage-gated Na+ channels are concentrated at the nodes of Ranvier
The ionic current flows one instant at a time
The magnitude of the current diminishes with distance
Which of the following is the first change in membrane potential that occurs at a sensory receptor?
Action Potential
End-plate potential
Excitatory Post-synaptic Potential
Generator potential
Which of the following is increases the rate of action potential conduction?
Decreased temperature
Decreased ECF [Na+]
Decreased [Ca2+]
Decreased axonal diameter
Which of the following is the mode of action of common analgesics?
Blocks voltage-gated Na+ channels
Blocks voltage-gated K+ channels
Blocks the Na+-K+ ATPAse pump
Blocks Na+ leak channels
Which of the following is an effect of hypernatremia on membrane potential?
RMP becomes less negative
The amplitude of AP increases
Repolarisation phase of AP is longer
Hyperpolarisation phase of AP is shorter
State one favourite fact you learned about action potentials.
