What is the normal resting potential of a neuron cell membrane?
  • +40mV
  • -30mV
  • +55mV
  • -70mV
Which ions are involved in an action potential?
  • Na; Cl
  • Na; K
  • K; Cl
  • Na; Ca
At which point on the diagram does depolarisation of the axon occur? 
sc-8 sb-4-Action Potentialimg_no 137.jpg
  • A
  • B
  • C
  • D
The sodium potassium pump restores the resting potential. By which process does this work? 
  • Osmosis
  • Diffusion
  • Facilitated diffusion
  • Active transport
When a neuron is not engaged in an impulse.
  • Resting potential
  • Action potential
  • Neural potential
  • Synaptic potential
A membrane potential becoming less negative is called
sc-8 sb-4-Action Potentialimg_no 138.jpg
  • hyperpolarization
  • depolarization
  • repolarization
  • polarization
In resting potential, neurons have more _________ on the outside of the cell membrane.
  • K+
  • NaCl
  • Na+
  • Cl-
What number(s) on the graph represents the THRESHOLD level of stimulus?
sc-8 sb-4-Action Potentialimg_no 139.jpg
  • 1 and 5
  • 2
  • 3
  • 6
When a membrane potential reaches +30mV, ________ channels open, ________ occurs, and ________ channels close.
sc-8 sb-4-Action Potentialimg_no 140.jpg
  • Sodium, depolarization, potassium
  • Potassium, depoloarization, sodium
  • sodium, repolarization, potassium
  • postassium, repolarization, sodium
Why is -55 mV a significant number?
  • This is the largest charge achieved during an action potential
  • This is the threshold required to complete an action potential
  • This is the resting charge of a neuron
  • This is the charge when all the sodium is inside the cell
The sodium-potassium pump....
  • Sends (Na+) into the cell
  • Sends (K+) into the cell
  • Exchanges (K+) & (Na+) during depolarization
  • Exchanges (K+) & (Na+) during hyperpolarization
At what stage are both ions present in large concentrations INSIDE the neuron?
  • Depolarizarion
  • Repolarization
  • Hyperpolarization
  • Resting Potential
What number on the graph represents the Hyperpolarization phase?
sc-8 sb-4-Action Potentialimg_no 141.jpg
  • 1
  • 2
  • 3
  • 4
When is the potassium channel open?
  • during rest only
  • during repolarization only
  • during depolarization only
  • all the time
Action potentials run along the ______ from ______ to ________.
  • axon, dendrites, axon terminals
  • axon, axon terminals, dendrites
  • dendrites, axon, axon terminals
  • axon terminals, axon, dendrites
An action potential is __________ in nature, with the inside of the neuron being more ________.
  • chemical, negative
  • electrical, negative
  • chemical, positive
  • electrical, positive
As the neuron fires, there's a reversal in _____ as the axon undergoes ________.
  • direction, depolarization
  • charge, depolarization
  • direction, repolarization
  • charge, repolarization
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