Nerve MCQs

1
NerveMCQs
2
A neuron generally has all of the following
principle areas except

• microvilli.
• a cell body.
• dendrites.
• an axon.

3
Which of the following is not a function of
neurons?

• Respond to physical and chemical stimuli.
• Conduct electrical impulses.
• Release specific chemical regulators.
• All of these are neuron functions.

4
A grouping of cell bodies located within the
central nervous system is known as a

• tract.
• nerve.
• nucleus.
• ganglion.

5
Involuntary effectors (glands, smooth or cardiac
muscle) are innervated (stimulated by)

• autonomic neurons.
• efferent neurons.
• motor neurons.
• association neurons.

6
A grouping of cell bodies located within the
central nervous system is known as a

• bipolar
• multipolar
• pseudounipolar

7
Myelin sheaths around axons located within the
CNS are formed by

• Schwann cells.
• microglia.
• astrocytes.
• oligodendrocytes.

8
Which of the following cell types is not a
supporting cell or glial cell of the nervous
system?

• Schwann cell
• oligodendrocyte
• astrocyte.
• association neuron

9
The glial cells in the CNS which are capable of
phagocytosis are

• astrocytes.
• oligodendrocytes.
• satellite cells.
• microglia.

10
Within the central nervous system astrocytes are
responsible for

• myelinateing axons.
• producing cerebrospinal fluid.
• phagocytizing particulate matter.
• aid in synapse formation.

11
In the absence of stimuli, all cells in the body
maintain a potential difference across the
membrane called the _____, in which the inside of
the cell is negatively charged in comparison to
the outside of the cell.

• action potential
• threshold potential
• resting membrane potential
• graded potential

12
The term "voltage regulated" means that the
membrane

• voltage gated ion channels open and close with
  changes in the membrane potential.
• potential is controlled by the Na/K pumps.
• gates will not respond unless the voltage is
  "regular."
• potential can only be controlled by an
  oscilloscope.

13
The diffusion of K out of the cell makes the
inside of the cell less positive, or more
negative, and acts to restore the original
resting membrane potential -a process called

• depolarization.
• hyperpolarization.
• repolarization.
• overshoot.

14
Both the depolarization and repolarization
changes that occur during the action potential
are produced by

• simple diffusion of ions down their concentration
  gradients.
• active transport pumps along the neuron membrane.
  
• negative feedback loops.
• carrier mediated transport.

15
Nerve impulses (action potentials) are conducted
along an axon without decrement. This means the
action potentials are conducted without

• decreasing velocity.
• altering the threshold potential.
• decreasing amplitude.
• altering the Na or K concentrations in the
  neuron.

16
Which of the following is not a neuron-neuron
synapse?

• neuromuscular junction
• axosomatic synapse
• axoaxonic synapse
• dendrodentritic synapse

17
Electrical synapses

• occur when two cells are joined by integrin
  proteins.
• are characterized by a synaptic cleft.
• occur between two cells of unequal size.
• require the presence of gap junctions.

18
The small membrane-enclosed compartments that
hold and release the neurotransmitter molecules
from within the presynaptic neuron, are called

• synaptic vesicles.
• synaptic clefts.
• terminal boutons.
• gap junctions.

19
As the intensity of the stimulus in a
presynaptic neuron increases, the number of
vesicles undergoing exocytosis ___, and the
number of released neurotransmitter molecules
____.

• increases increases
• increases decreases
• decreases increases
• decreases decreases

20
The blood-brain barrier is composed of two cells
types, endothelial cells and

• oligodendrites
• microglia
• Schwann cells
• astrocytes