Activities Quiz
1.

A neuron's nucleus is located in its _____. (Activity 48A)

cell body
axon
myelin sheath
dendrite
synaptic terminals


2.

A nerve impulse moves toward a neuron's cell body along _____. (Activity 48A)

dendrites
synaptic terminals
oligodendrocytes
axons
nodes of Ranvier


3.

A nerve impulse moves away from a neuron's cell body along _____. (Activity 48A)

dendrites
Nissl bodies
synapses
axons
glia


4.

An impulse relayed along a myelinated axon "jumps" from _____ to _____. (Activity 48A)

oligodendrocyte ... Schwann cell
node of Ranvier ... Schwann cell
node of Ranvier ... node of Ranvier
Schwann cell ... Schwann cell
Schwann cell ... node of Ranvier


5.

Axons insulated by a(n) _____ are able to conduct impulses faster that those not so insulated. (Activity 48A)

node of Ranvier
synaptic terminal
myelin sheath
layer of asbestos
astrocytes


6.

What type of cell makes up the myelin sheath of a motor neuron? (Activity 48A)

astrocytes
microglial cells
Ranvier cells
ependymal cells
Schwann cells


7.

What part of a neuron relays signals from one neuron to another neuron or to an effector? (Activity 48A)

dendrite
axon hillock
synaptic terminal
axon
node of Ranvier


8.

A neuron has a resting potential of about _____ millivolts. (Activity 48B)

+50
+35
–55
–70
–80


9.

An action potential moves along a(n) _____. (Activity 48B)

myelin sheath
axon
dendrite
synapse
cell body


10.

At rest, which of these plays a role in establishing the charge differential across a neuron's plasma membrane? (Activity 48B)

the sodium-potassium pump moving sodium ions into the neuron and potassium ions out of the neuron
the diffusion of sodium ions out of the neuron
the diffusion of potassium ions into the neuron
the sodium-potassium pump moving sodium ions out of the neuron and potassium ions into the neuron
the diffusion of sodium ions into the neuron


11.

The transmission of a nerve impulse first triggers the _____. (Activity 48B)

action of the sodium-potassium pump
opening of voltage-gated sodium channels and the diffusion of sodium ions into the neuron
opening of voltage-gated sodium channels and the diffusion of sodium ions out of the neuron
opening of voltage-gated potassium channels and the diffusion of potassium ions out of the neuron
opening of voltage-gated potassium channels and the diffusion of potassium ions into the neuron


12.

A stimulus has opened the voltage-gated sodium channels in an area of a neuron's plasma membrane. As a result, _____ rushes into the neuron and diffuses to adjacent areas; this in turn results in the _____ in the adjacent areas. (Activity 48B)

potassium ... opening of voltage-gated potassium channels
sodium ... opening of voltage-gated potassium channels
sodium ... opening of voltage-gated sodium channels
sodium ... closing of voltage-gated sodium channels
potassium ... opening of voltage-gated sodium channels


13.

Which of these causes the release of neurotransmitter molecules? (Activity 48C)

the receipt of a signal from the postsynaptic neuron
the opening of voltage-regulated calcium channels and the diffusion of calcium ions out of the neuron
an action potential reaching the end of the cell body
an action potential reaching the end of the axon
an action potential reaching the end of the dendrite


14.

The space between an axon of one neuron and the dendrite of another neuron is called a(n) _____. (Activity 48C)

synaptic cleft
node of Ranvier
internodes
synapse
synaptic terminal


15.

Neurons store neurotransmitter molecules in vesicles located within _____. (Activity 48C)

the cell body
myelin
the synaptic cleft
dendrites
synaptic terminals



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2002 Pearson Education, Inc.,
publishing as Benjamin Cummings