WorksheetsExcitable Quiz A
Total questions: 20
Worksheet time: 3600secs
Name
Class
Date
1.
If a cell becomes more permeable to potassium, which way does the resting membrane potential move?
a)
Toward potassium’s equilibrium potential
b)
Away from potassium’s equilibrium potential
c)
No change
d)
Becomes positive
2.
Which part of the neuron transmits the electrical signal from one end of the cell to the other?
a)
Dendrite
b)
Soma
c)
Axon
d)
Axon terminal
3.
TRUE or FALSE: Open sodium channels accelerate the repolarization phase of an action potential.
a)
True
b)
False
c)
Depends on ion gradient
d)
Only in muscle cells
4.
An excitatory post synaptic potential (EPSP) is:
a)
Depolarizing
b)
Repolarizing
c)
Hyperpolarizing
d)
None of the above
5.
If the permeability of sodium were decreased, what would happen to the resting membrane potential?
a)
It would increase
b)
It would decrease
c)
It would increase then decrease
d)
No change
6.
Which ion is used to refresh the action potential as it travels down the axon?
a)
Potassium
b)
Sodium
c)
Calcium
d)
Chloride
7.
What ion allows neurotransmitters to be dumped into the synaptic cleft?
a)
Potassium
b)
Sodium
c)
Calcium
d)
Chloride
8.
Where is an action potential generated in a neuron?
a)
Dendrite
b)
Soma
c)
Axon hillock
d)
Axon terminal
9.
Graded potentials are used where in a neuron?
a)
Axon
b)
Dendrites
c)
Axon terminal
d)
Soma
10.
What does myelin do to a neuron's action potential?
a)
Slows it down
b)
Blocks it
c)
Insulates and speeds it up
d)
Has no effect
11.
Is sodium in higher concentrations outside or inside of the cell?
a)
Inside
b)
Outside
c)
Equal
d)
Depends on the cell type
12.
True/False: Pumps are non-specific for ions
a)
True
b)
False
c)
Only in neurons
d)
Only in muscle cells
13.
If an atom is negatively charged, it has more of what?
a)
Protons
b)
Ions
c)
Neutrons
d)
Electrons
14.
The Nernst equation is used to calculate what?
a)
Membrane permeability
b)
Equilibrium potential
c)
Resting potential
d)
Ion flux
15.
In the Nernst equation, z designates what?
a)
Membrane thickness
b)
Ion permeability
c)
Ion charge
d)
Ion mass
16.
Are cells equally permeable to ions?
a)
Yes
b)
No
c)
Only during action potentials
d)
Only in muscle cells
17.
When the permeability of a cell to sodium increases, its resting membrane potential moves toward or against its equilibrium potential?
a)
Toward
b)
Against
c)
No change
d)
Becomes negative
18.
A cell that receives neurotransmitters from a neuron is considered a:
a)
Presynaptic cell
b)
Postsynaptic cell
c)
Axon terminal
d)
Receptor cell
19.
Depolarization makes the cell membrane more:
a)
Negative
b)
Neutral
c)
Positive
d)
Unstable
20.
Repolarization moves the membrane potential:
a)
Toward resting value
b)
Toward threshold
c)
Toward positive
d)
Toward zero
100 %
