Class quiz 8 Flashcards

Ciliated CNS neuroglia that play an active role in moving the cerebrospinal
fluid are:

ependymal cells

Schwann cells

oligodendrocytes

astrocytes

satellite cells

Adrenergic synapses release the neurotransmitter:

acetylcholine

norepinephrine

dopamine

serotonin

GABA

Schwann cells in the PNS are functionally similar to _____ in the CNS.

oligodendrocytes

astrocytes

ependymal cells

microglia

The axon is connected to the soma at the

synapse.

synaptic knobs.

collaterals.

axon hillock.

telodendria.

The period after an initial stimulus when a neuron is not sensitive to another stimulus is the:

resting period

repolarization period

depolarization period

refractory period

The most abundant class of neuron in the central nervous system is

bipolar.

pseudopolar.

multipolar.

anaxonic.

unipolar.

Which of the following are a type of glial cell found in the peripheral
nervous system?

astrocytes

microglia

ependymal cells

satellite cells

oligodendrocytes

Voltage regulated channels can be found:

at the motor end plate

on the surface of the dendrites

in the membrane that covers axons

on the soma of neurons

along the perikaryon of neurons

Glial cells that surround the neurons in ganglia are

astrocytes.

satellite cells.

oligodendrocytes.

ependymal cells.

microglia.

The following are the main steps in the generation of an action potential.

1. Sodium channels are inactivated.
2. Voltage-gated potassium channels open and potassium moves out of the
cell, ini!a!ng repolariza!on.
3. Sodium channels regain their normal proper!es.
4. A graded depolariza!on brings an area of an excitable membrane to
threshold.
5. A temporary hyperpolarization occurs.
6. Sodium channel activation occurs.
7. Sodium ions enter the cell and depolarization occurs.

The proper sequence of these events is

4, 2, 5, 6, 7, 3, 1.

6, 7, 4, 1, 2, 3, 5.

4, 6, 7, 3, 2, 5, 1.

2, 4, 6, 7, 1, 3, 5.

4, 6, 7, 1, 2, 3, 5.

Opening of sodium channels in the membrane of a neuron results in:

depolarization

repolarization

hyperpolarization

increased negative charge inside the membrane

reestablishing the resting potential

Which of these ions is actively transported through the cell membrane to
establish a resting potential?

Cl

Mg

Ca

K

Na

Collections of nerve cell bodies outside of the central nervous system are
called:

nuclei

nerves

ganglia

tracts

The sodium pump:

pumps three sodium ions outside the cell and two potassium ions inside

pumps two sodium ions outside the cell and three potassium ions inside

pumps three sodium ions inside the cell and two potassium ions outside

pumps two sodium ions inside the cell and three potassium ions outside

The part of a neuron that conducts impulses away from its cell body is
called a(an):

axon

dendrite

neurolemma

soma

nissil body

Functions of astrocytes include all of the following, except
forming a three-dimensional framework for the CNS.

guiding neuron development.

maintaining the blood-brain barrier.

responding to neural tissue damage.

conducting action potentials.

An inhibitory postsynaptic potential (IPSP) is associated with:

a change in sodium ion permeability

hyperpolarization

opening of voltage-gated channels

lowering the threshold for an action potential to occur

Saltatory conduction is made possible by:

the myelin sheath

large nerve fibers

diphasic impulses

rapid conduction of local potentials

nissil bodies

Axons terminate in a series of fine extensions known as:

telodendria

synaptic knobs

collaterals

hillocks

synapses

Which of the following is not a function of the neuroglia?

secretion of cerebrospinal fluid

maintenance of blood-brain barrier

phagocytosis

memory

support