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Neuroglia and Action Potential Review

Total questions: 25

Worksheet time: 23mins

Name
Class
Date
1.

ATP is required to run

a)

Na/K pumps

b)

leak channels

c)

gated channels

d)

myelin sheaths

2.

Which channels open FIRST at time #2?

a)

leak channels only

b)

gated Na channels

c)

gated K channels

d)

none

3.
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
4.
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
5.
When a neuron is depolarized, what are the first channels to open?
a)
Sodium
b)
Potassium
c)
Calcium
d)
ACTH
6.

Small cells that engulf and destroy microbes and cellular debris in the CNS

a)

microglia

b)

horns

c)

neuroglia

d)

astrocytes

7.

Neuroglial cells that form the fatty myelin sheath on neurons in the CNS are ___________ in the PNS are ________________?

a)

ganglia and oligodendroglia

b)

astrocytes and schwann cells

c)

schwann cells and oligodendroglia

d)

oligodendroglia and schwann cells

8.
What is the main function of oligodendrocytes?
a)
Production of insulation and protection
b)
Maintain the health of the neuron
c)
Brace and support the neuron to it's nurtient supply
d)
Lining of the central cavities to circulate spinal fluid
9.
The function of the ependymal cells is ___________.
a)
Protection of the delicate neuron axon
b)
Maintain the health of the neuron
c)
Circulates the cerebrospinal fluid
d)
Insulate the electrical impulse
10.
What type of neuroglial cell attaches neurons to capillaries?
a)
Astrocyte
b)
Oligodendrocytes
c)
Microglial
d)
Ependymal
11.
What is the name of cells that support the cells that send information?
a)
Neurons
b)
Axons
c)
Dendrites
d)
Neuroglia
12.

Reorder the following (starting at the action potential)

a)

Action potential reached (+30mV)

b)

Na+ inactivation gates close, K+ gates open

c)

K+ exits the cell, repolarization

d)

K+ still open, goes below -70 mV, hyperpolarization

e)

Na/K pump restores to resting potential

1)
2)
3)
4)
5)
13.

Reorder the following (starting at beginning)

a)

Resting potential (-70mV), stimulus received

b)

Na+ gates open, threshold reached (-55 mV)

c)

Na+ gates open

d)

Na+ moves into the axon

e)

Action potential reached (+30mV)

1)
2)
3)
4)
5)
14.

When is the potassium channel open?

a)

during rest only

b)

during repolarization only

c)

during depolarization only

d)

all the time

15.
When a neuron is not engaged in an impulse.
a)
Resting potential
b)
Action potential
c)
Neural potential
d)
Synaptic potential
16.

An electrical impulse within a single neuron is called a

a)

synapse

b)

membrane potential

c)

action potential

d)

cell body

17.

When the membrane potential reaches +30mV, ________ channels open, ________ occurs, and ________ channels close.

a)

sodium, depolarization, potassium

b)

potassium, depoloarization, sodium

c)

sodium, repolarization, potassium

d)

postassium, repolarization, sodium

18.

Which number on the graph represents the threshold potential?

a)

1

b)

2

c)

3

d)

4

e)

6

19.
A membrane potential becoming less negative is called
a)

hyperpolarization

b)

depolarization

c)

repolarization

d)

polarization

20.
At which point on the diagram does depolarisation of the axon occur? 
a)
A
b)
B
c)
C
d)
D
21.

At resting membrane potential, neurons have more​ (a)   on the inside of the cell membrane.

Choose from the below words
K+
NaCl
Na+
Cl-
22.

At resting membrane potential, neurons have more​ (a)   on the outside of the cell membrane.

Choose from the below words
Na+
K+
NaCl
Cl-
23.
What is the normal resting potential of a neuron cell membrane?
a)
+40mV
b)
-30mV
c)
+55mV
d)
-70mV
24.

Action potentials run along the ______ from ______ to ________.

a)

axon, dendrites, axon terminals

b)

axon, axon terminals, dendrites

c)

dendrites, axon, axon terminals

d)

axon terminals, axon, dendrites

25.
Which ions are involved in an action potential?
a)
Na; Cl
b)
Na; K
c)
K; Cl
d)
Na; Ca

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