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WorksheetsAction Potentials
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
Part of a neuron that receives information from other neurons
a)
axon
b)
dendrites
c)
myelin sheath
d)
synapse
2.
a junction at which a neuron meets another cell
a)
axon
b)
dendrites
c)
myelin sheath
d)
synapse
3.
What number(s) on the graph represents the Resting Potential?
a)
1 and 2
b)
1 and 5
c)
2 and 3
d)
3 and 4
4.
When a neuron is depolarized, what are the first channels to open?
a)
Sodium
b)
Potassium
c)
Calcium
d)
ACTH
5.
When a neuron is resting, the inside of the axon has a ____________ charge.
a)
-55 mV
b)
-70 mV
c)
40 mV
d)
-75 mV
6.
When a neuron is not engaged in an impulse.
a)
Resting potential
b)
Action potential
c)
Neural potential
d)
Synaptic potential
7.
Which ions are involved in the electrical nerve impulse?
a)
Iodine and Sodium
b)
Potassium and Sodium
c)
Iron and Sodium
d)
Calcium and Iodine
8.
What number on the graph represents the Depolarization phase?
a)
1
b)
2
c)
3
d)
4
9.
What number on the graph represents the Hyperpolarization phase?
a)
1
b)
2
c)
3
d)
4
10.
The sodium-potassium pump....
a)
Sends (Na+) into the cell
b)
Sends (K+) into the cell
c)
Exchanges (K+) & (Na+) during depolarization
d)
Exchanges (K+) & (Na+) during hyperpolarization
11.
Why is -55 mV a significant number?
a)
This is the largest charge achieved during an action potential
b)
This is the threshold required to complete an action potential
c)
This is the resting charge of a neuron
d)
This is the charge when all the sodium is inside the cell
12.
At what stage are both ions present in large concentrations INSIDE the neuron?
a)
Depolarizarion
b)
Repolarization
c)
Hyperpolarization
d)
Resting Potential
13.
At what stage does Potassium end outside the neuron, and Sodium ends inside the neuron?
a)
Depolarizarion
b)
Repolarization
c)
Hyperpolarization
d)
Resting Potential
14.
Why is hyperpolarization important?
a)
It makes sure the neuron is healthy
b)
It prevents a second, unwanted signal from being sent
c)
It makes sure the neurons are in the correct space
d)
It makes sure the charge is back at -70 mV
15.
At what stages do Sodium/Potassium Channels open?
a)
Repolarization/ Repolarization
b)
Depolarization/ Hyperpolarization
c)
Hyperpolarization/ Repolarization
d)
Depolarization/ Repolarization
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