Which is not characteristic of neurons?

Require continuous supplies of glucose and oxygen

No exceptions; all of these are characteristic of neurons.

Conductive activity in a neuron generally causes it to secrete

a specific neurotransmitter that either excites or inhibits its target.

a specific neurotransmitter that always excites its target.

several types of neurotransmitters simultaneously, all of which excite the cell's target.

several types of neurotransmitters simultaneously, that are broadcast to excite and inhibit multiple targets.

several types of neurotransmitters simultaneously, that all work to prevent another immediate impulse.

one axon and one dendrite extending from the cell body.

two axons extending from the cell body.

two dendrites extending from the cell body.

a single short process that extends from the cell body and then splits into a peripheral and a central branch.

A mixed nerve is one that contains both

cranial and spinal nerve fibers.

an endoneurium and an epineurium.

presynaptic and postsynaptic neurons.

Most commonly, a synapse is made between a

presynaptic neuron's axon and a postsynaptic neuron's dendrite.

presynaptic neuron's dendrite and a postsynaptic membrane's cell body.

presynaptic neuron's axon hillock and a postsynaptic neuron's cell body.

presynaptic neuron's soma and a postsynaptic neuron's synaptic knob.

When transmission occurs at a synapse, neurotransmitter is released by

the presynaptic neuron's synaptic knob into the synaptic cleft.

the postsynaptic neuron's dendrites into the synaptic cleft.

the presynaptic neuron's dendrites into the synaptic cleft.

the presynaptic neuron's soma into synaptic vesicles.

the postsynaptic neuron's telodendria into the axon hillock.

The glossy-white appearance of most axons is due to

the high lipid content of the myelin sheath.

their abundance of chromatophilic substance.

the white color of the perivascular feet.

the covering of ependymal cells.

Which statement is true regarding the action of an oligodendrocyte?

Each oligodendrocyte can form a myelin sheath around many axons simultaneously.

An oligodendrocyte is responsible for forming part of the blood-brain barrier.

Oligodendrocytes function only within the PNS.

Each oligodendrocyte can wrap only a 1-mm portion of a single axon.

A neurolemmocyte attacks pathogens.

The function of myelin is to

produce faster nerve impulse propagation.

block the transmission of a nerve impulse.

provide points of attachment for nerve threads.

produce slow but continuous impulse conduction.

is a cablelike bundle of parallel axons.

carries only sensory information.

carries information only toward the PNS.

Which choice correctly orders the connective tissue wrappings of a nerve, beginning at the outermost layer?

Epineurium → perineurium → endoneurium

Perineurium → epineurium → endoneurium

Perineurium → endoneurium → epineurium

Epineurium → endoneurium → perineurium

Endoneurium → perineurium → epineurium

The type of voltage-gated channel that possesses an inactivation gate that temporarily closes after the channel is active is the

voltage-gated potassium channel.

voltage-gated chloride channel.

The electrochemical gradient refers to

the combination of electrical and chemical gradients between two areas.

the difference in concentration of a substance between two areas.

the difference in electrical charge between two areas.

the resistance a membrane has to allow any charged chemical to pass through it.

The most crucial factor determining the resting potential of a neuron is the diffusion of

potassium out of the cell through leak channels.

potassium into the cell through gated channels.

sodium out of the cell through leak channels.

sodium into the cell through gated channels.

A graded potential is one that

varies in size depending on the magnitude of the stimulus (larger voltage change for stronger stimulus).

is all or none (always the same intensity).

travels the length of the nerve fiber (is long-distance).

lasts for several seconds after ion channels have opened, closed, and reset.

In neurophysiology, the term "summation" refers to the addition of

postsynaptic potentials at the initial segment.

action potentials at the neurofibril node.

excitatory neurotransmitter molecules at a receptor.

resting membrane potentials in a particular area of the brain.

presynaptic hyperpolarizations.

Arrival of an action potential at the synaptic knob results in

opening of voltage-gated calcium channels and diffusion of calcium into the synaptic knob.

opening of voltage-gated calcium channels and diffusion of calcium out of the synaptic knob to the interstitial fluid.

closure of voltage-gated calcium channels in the synaptic knob membrane.

opening of chemically gated calcium channels and diffusion of calcium into the synaptic knob.

opening of chemically gated calcium channels and diffusion of calcium out of the synaptic knob to the interstitial fluid.

In order to trigger the release of neurotransmitter from a neuron terminal, calcium ions

bind to proteins on the surface of synaptic vesicles.

exit the synaptic knob through diffusion.

penetrate the synaptic vesicles and bind to molecules of neurotransmitter.

bind to ion channels on the neuron membrane and cause them to open for the transmitter.

The main way acetylcholine is cleared from a synapse is by

uptake by the postsynaptic cell.

reuptake by the presynaptic cell.

being engulfed by a supporting glial cell.

Exam 4 Review – Multiple Choice

Authored by Susana Well

Other

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106 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Receptors are parts of the nervous system that allow it to

initiate responses to information.

process information.

collect information.

conduct impulses to muscles.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The nervous system controls the activity of muscles and glands. Muscles and glands can generate changes and are therefore called

afferents.

effectors.

stimuli.

visceral.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Nerves and ganglia are structures found in the

central nervous system.

peripheral nervous system.

central and peripheral nervous systems.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is not a general function of the nervous system?

Transporting materials throughout the body

Collecting sensory information

Processing and integrating information from receptors

Responding to stimuli through motor commands to effectors

No exceptions; all are general functions of the nervous system.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The afferent division of the nervous system is also known as the ________ division.

motor

cranial

ganglial

efferent

sensory

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is not a function of the motor division of the nervous system?

Conducts impulses from the CNS

Transmits impulses to muscles and glands

Transmits impulses from the viscera

Voluntary control of skeletal muscle

Involuntary control of the heart

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The portion of the nervous system that conducts impulses from the skin, joints, skeletal muscles, and special senses is the ________ division.

autonomic motor

somatic sensory

somatic motor

visceral sensory

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Exam 4 Review – Multiple Choice

Receptors are parts of the nervous system that allow it to

The nervous system controls the activity of muscles and glands. Muscles and glands can generate changes and are therefore called

Nerves and ganglia are structures found in the

Which is not a general function of the nervous system?

The afferent division of the nervous system is also known as the ________ division.

Which is not a function of the motor division of the nervous system?

The portion of the nervous system that conducts impulses from the skin, joints, skeletal muscles, and special senses is the ________ division.

The portion of the nervous system that has voluntary control over skeletal muscles is the ________ division.

A neuron conducting an impulse from the CNS to the detrusor muscle of the urinary bladder would be classified as a(n) ________ neuron.

A neuron conducting an impulse from the stomach wall to the CNS would be classified as a(n) ________ neuron.

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