nervous system

This is NOT a part of the peripheral

nervous system:

a. cranial nerve

b. ganglion

c. spinal cord

d. spinal nerve

BACK TO GAME

c

This extensive network of axons is located

outside of the CNS:

a. ganglion

b. plexus

c. sensory receptor

d. spinal cord

b

This portion of the motor division of the

nervous system conducts action potentials

from the central nervous system to skeletal

muscle fibers.

a. afferent

b. autonomic

c. somatic

d. sympathetic

BACK TO GAME

c

The cell bodies of sensory neurons are

located in the dorsal root ganglion near the

spinal cord.

True/False

BACK TO GAME

true

__________ pairs of cranial nerves originate

from the brain, and __________ pairs of

spinal nerves originate from the spinal cord.

a. two, twelve

b. eight, twenty-four

c. twelve, thirty-one

d. fifteen, thirty-six

e. sixteen, thirty-eight

c

These cells conduct action potentials from

one neuron to another within the CNS:

a. sensory (afferent) neurons

b. motor (efferent) neurons

c. interneurons (association) neurons

d. bipolar neurons

c

Axons terminate by branching to form

small extensions with enlarged ends which

are called this:

a. dendrites

b. neuron cell bodies

c. presynaptic terminals

d. postsynaptic membranes

e. axon hillocks BACK TO GAME

c

These cell types produce and help

circulate cerebrospinal fluid:

a. astrocytes

b. microglia

c. ependymal cells

d. Schwann cells

e. oligodendrocytes

c

These statements about unipolar neurons

are all true except:

a. most are sensory neurons

b. have a single process extending

from the cell body

c. located in the eye and nasal cavity

d. have no dendrites

c

This statement best describes the myelin

sheath:

a. made of Schwann cells (neurolemmocytes)

b. covering surrounding an axon

c. provides insulation from other axons

d. helps conduct the action potential more

rapidly

e. all are true

e

Compared to the outside of the resting

plasma membrane, the inside surface of

the membrane is this:

a. positively charged

b. electrically neutral

c. negatively charged

d. continuously reversing so that it is

positive one second and negative

the next BACK TO GAME

c

Because of the sodium-potassium pump,

there are:

a. more K+ outside the cell than inside and

more Na+ inside the cell than outside

b. more K+ inside the cell than outside and

Na+ outside the cell than inside

c. more K+ and Na inside the cell than outside

d. more K+ and Na outside the cell than inside

b

The resting membrane potential results

when the tendency for these ions to diffuse

out of the cell is balanced by their attraction

to opposite charges inside the cell:

a. Na+

b. K+

c. Cl-

d. negatively charged proteins

e. Ca2+

b

The resting membrane potential of nerve

cells due to the electric charge difference

across the plasma membranes is

approximately -85mv.

True/False

false

Hyperpolarization, which is an increase in

membrane potential, can be caused by

this:

a. opening of Cl- gated channels

b. opening of Ca2+ gated channels

c. opening of Na+ gated channels

d. increase of extracellular K+

a

The following are characteristics of action

potentials except:

a. all-or-none

b. caused by graded potentials

reaching threshold

c. stimulus strength determines the

magnitude

d. depolarization is followed by

repolarization

c

Depolarization occurs because more Na+

diffuse into the cell than K + diffuse out of it.

True/False

true

This best describes the absolute

refractory period:

a. limits how many action potentials can be

produced during a given period of time

b. prevents an action potential from starting

another action potential at the same point on

the plasma membrane

c. is the period of time when a strong stimulus

can initiate a second action potential

d. both a and b

e. all of the above

d

During saltatory conduction, action

potentials jump from this:

a. one astrocyte to another

b. an axon to a dendrite

c. one internode to another

d. one node of Ranvier to another

e. one microglia cell to another

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d

If the duration of the absolute refractory

period of a nerve cell is 1millisecond (ms),

this many action potentials are generated

by a maximal stimulus in 1 second:

a. 1

b. 10

c. 100

d. 1000

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d

These are all part of a chemical synapse

except:

a. presynaptic terminal

b. synaptic cleft

c. postsynaptic membrane

d. connexons

d

Acetylcholinesterase, monoamine oxidase

(MAO), and catechol-O-methyltransferase are

this:

a. neurotransmitters

b. enzymes that break down neurotransmitters

c. enzymes that act as neuromodulators

d. enzymes that could produce an EPSP

e. substances that could produce an IPSP

b

This characteristic can be produced by an

IPSP:

a. local hyperpolarization

b. decreased excitability of neuron

c. increased permeability of

postsynaptic membrane to K+ and

Cl- ions

d. all of these

d

When two action potentials arrive in very

close succession at a single presynaptic

terminal, this action occurs:

a. an IPSP is produced

b. the second action potential cancels

the first

c. spatial summation occurs

d. temporal summation occurs

d

This combination represents a convergent

pathway in the nervous system:

a. 1 presynaptic neuron synapses with 4

postsynaptic neurons

b. 1 presynaptic neuron synapses with 1

postsynaptic neuron

c. 3 presynaptic neurons synapse with 1

postsynaptic neuron

d. an afferent neuron synapses with an

association neuron BACK TO GAME

c

This kind of nerve fiber would conduct

action potentials the FASTEST:

a. unmyelinated nerve fibers

b. type A fibers

c. type B fibers

d. type C fibers

BACK TO GAME

b