Activities Quiz

Chapter 48: Nervous Systems

Activities Quiz

1 .

A neuron's nucleus is located in its _____. (Activity: Neuron Structure)

cell body

axon

myelin sheath

dendrite

synaptic terminals

2 .

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

dendrites

synaptic terminals

oligodendrocytes

axons

nodes of Ranvier

3 .

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

dendrites

Nissl bodies

synapses

axons

glia

4 .

An impulse relayed along a myelinated axon "jumps" from _____ to _____. (Activity: Neuron Structure)

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: Neuron Structure)

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: Neuron Structure)

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: Neuron Structure)

dendrite

axon hillock

synaptic terminal

axon

node of Ranvier

8 .

A neuron has a resting potential of about _____ millivolts. (Activity: Nerve Signals: Action Potentials)

+50

+35

–55

–70

–80

9 .

An action potential moves along a(n) _____. (Activity: Nerve Signals: Action Potentials)

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: Nerve Signals: Action Potentials)

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: Nerve Signals: Action Potentials)

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: Nerve Signals: Action Potentials)

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: Signal Transmission at a Chemical Synapse)

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: Signal Transmission at a Chemical Synapse)

synaptic cleft

node of Ranvier

internodes

synapse

synaptic terminal

15 .

Neurons store neurotransmitter molecules in vesicles located within _____. (Activity: Signal Transmission at a Chemical Synapse)

the cell body

myelin

the synaptic cleft

dendrites

synaptic terminals