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Worksheetsaction potentials
Total questions: 15
Worksheet time: 28mins
When a neuron is becoming depolarized, what are the first channels to open?
Sodium
Potassium
Calcium
ACTH
When a neuron is resting, the inside of the axon has a ____________ charge.
-55 mV
-60 mV
40 mV
-75 mV
When a neuron is not engaged in the transmission of an impulse.
Resting potential
Action potential
Neural potential
Synaptic potential
Which of the following restores the resting membrane potential in a neurone?
I. Na+ channels opening
II. K+ channels closing
III. The Na+/K+ ATP pump
I and II only
II and III only
I and III only
III only
Which of the following is/are true of repolarisation?
Na+ channels close
K+ diffuses into the neuron
The membrane potential becomes more negative
Na+ diffuses out of the neuron
In the figure above, what is occurring at step #4?
Neuron receives enough stimulation, threshold is reached
Na+ channels open allowing Na+ to diffuse inward, depolarizing the membrane
K+ channels open and Na+ channels open, action potential begins
K+ channels open allowing K+ to diffuse out, repolarizing the membrane
Na+ are being pumped out and K+ are being pumped into the cell
-60 mV is the measure of a
Threshold Potential
Action Potential
Resting Potential
End Point Potential
What contains the nucleus of the neuron?
Terminal Bouton
Cell Body
Myelin Sheath
An electrical impulse within a single neuron is called a
synapse
membrane potential
action potential
cell body
Depolarization occurs when
sodium channels open
potassium channels open
sodium channels close
potassium channels close
