Deck 2: Communication Within the Nervous System

Question 1

About how many neurons are found in the human brain?

A)10 million
B)1 billion
C)100 billion
D)10 trillion

Answer 1

100 billion

Question 2

If you could surgically remove a single neuron from the brain and place it on a slide,what structure(s)would you have to destroy?

A)Soma
B)Axon
C)Synapses
D)Dendrites

Answer 2

Synapses

Question 3

The part of a neuron that contains the nucleus is called the:

A)Axon
B)Soma
C)Dendrite
D)Mitochondrion

Answer 3

Soma

Question 4

___ have a branched structure and receive stimulation from other neurons.

A)Dendrites
B)Axons
C)Glial cells
D)Soma

Question 5

___ neurons control movements and actions of organs.

A)Phasic
B)Inter-
C)Motor
D)Sensory

Question 6

The part of a neuron that transmits information over long distances is the:

A)Soma
B)Axon
C)Dendrite
D)Synapse

Question 7

___ are one of the cell types composing the nervous system.

A)Soma
B)Neurons
C)Mitochondria
D)Myelin

Question 8

The soma of a neuron contains the:

A)Glial material
B)Neurotransporters
C)Neural receptors
D)Nucleus

Question 9

The axon of a neuron:

A)Ends in swellings known as terminals
B)Controls the life processes of the cell
C)Insulates the brain's electrical signals
D)Contains the cell's nucleus

Question 10

The largest part of a neuron is the:

A)Soma
B)Axon
C)Terminal
D)Dendritic process

Question 11

Cells that convey environmental information;carry out the functions underlying thought,emotion,and movements;and transmit commands out to the body's organs and muscles are called:

A)Neurons
B)Dendrites
C)Supporting cells
D)Phagocytes

Question 12

Ninety percent of the cells in the brain are:

A)Neurons
B)Glial cells
C)Axonic cells
D)Dendritic cells

Question 13

Neurons make up only about % of the cells in the brain and about of its volume.

A)25,one-third
B)10,one-half
C)90,three-quarters
D)33,one-third

Question 14

Axons can be anywhere from ___ to more than ___ in length.

A)3 centimeters,1 meter
B)1 meter,2 meters
C)1 millimeter,50 meters
D)0)1 millimeter,1 meter

Question 15

The swellings on the ends of axonal branches are called:

A)Dendritic spines
B)Nodes of Ranvier
C)Terminals
D)Myofilaments

Question 16

The most important supporting cells of the brain are the:

A)Neurons
B)Glia
C)Neurofilaments
D)Schwann cells

Question 17

The connection point between two neurons is called the:

A)Terminal
B)Axon
C)Soma
D)Synapse

Question 18

William,a philosophy major,asked Ian the psychology major what type of cell contributes the most to Ian's "being" who he is.Without hesitation,Ian replied:

A)Nerves
B)Brain cells
C)Neurons
D)Somatic cells

Question 19

___ can be long enough to provide a direct connection between the spinal cord and the toes of a giraffe.

A)Interneurons
B)Projection neurons
C)Axons
D)Dendrites

Question 20

The dendrites of a neuron:

A)Transmit information to the cell body
B)Provide the life processes of the cell
C)Transmit neural impulses to the terminal buttons
D)Release neurotransmitters

Question 21

___ are atoms that have gained or lost one or more electrons.

A)Ions
B)Polarizations
C)Electrolytes
D)Positrons

Question 22

One function of the specialized protein channels in a cell membrane is to:

A)Selectively allow substances to enter or leave the cell
B)Provide oxygen and nutrients for the cell
C)Package neurotransmitters
D)Form an impermeable barrier to all substances foreign to the cell

Question 23

A ___ neuron gives rise to an axon and to the dendritic processes from opposite ends of the soma.

A)motor
B)unipolar
C)bipolar
D)multipolar

Question 24

Many business deals involve a "middle man" who communicates between buyer and seller.The "middle man" between a sensory neuron and a motor neuron is a(n):

A)Synapse
B)Projection neuron
C)Glial cell
D)Interneuron

Question 25

The lipids that compose the cell membrane are arranged with "heads" and "tails" such that:

A)The "heads" are in contact with extracellular and intracellular fluid and the "tails" oriented away from these fluids
B)The "tails" are in contact with extracellular and intracellular fluid and the "heads" oriented away from these fluids
C)Half of all "heads" and "tails" are in contact with extracellular fluid
D)Both "heads" and "tails" are in contact with intracellular fluid

Question 26

The seawater-like solution inside neurons and bathing their outside are known respectively as:

A)Extracellular and intracellular
B)Intracellular and extracellular
C)Cellular and extracellular
D)Intramembrane and extramembrane

Question 27

The resting membrane potential is:

A)A function of anions concentrated inside the cell
B)Positive inside with respect to outside
C)The result of a freely permeable membrane
D)The difference in electrical charge inside and outside the inactive neuron

Question 28

Sensory neurons:

A)Control muscles and produce movement
B)Send messages away from the brain toward the periphery
C)Gather information from the environment and convey it into the central nervous system
D)Have cell bodies covered with myelin

Question 29

Sodium ions are most concentrated in the ___ fluid.

A)intracellular
B)extracellular
C)intracellular and extracellular
D)polarized

Question 30

In motor neurons,the axon and the dendrites branch out from the soma in several directions,giving this type of neuron the designation of a ___ neuron.

A)multi-fibered motor
B)unipolar
C)bipolar
D)multipolar

Question 31

Which of the statements about cell membranes is not correct?

A)They contain specialized protein channels.
B)They are made of two layers of lipids.
C)Many millennia ago they were free-living single-celled organisms.
D)They define cell boundaries.

Question 32

When it is said that the cell membrane has a difference in electrical charge between its inside and the outside,this means the membrane is:

A)Potentialized
B)Polarized
C)Hyperpolarized
D)Viable

Question 33

A ___ neuron's soma gives rise to a short stalk that divides into two branches.

A)unifibered
B)unipolar
C)bipolar
D)multipolar

Question 34

The cell membrane of a neuron is a double layer made up of:

A)Protein and connective tissue
B)Protein and lipid (fat)
C)Lipid (fat)and connective tissue
D)Intracellular material and extracellular material

Question 35

The fact that the cell membrane is highly permeable to some substances and much less so to other substances is one variable underlying the cell being ___.

A)potentialized
B)polarized
C)hyperpolarized
D)viable

Question 36

The most common type of neuron in the brain is the ___.

A)motor neuron
B)unipolar neuron
C)interneuron
D)multipolar neuron

Question 37

The ___ is the difference in electrical potential between the inside and outside of an inactive neuron.

A)action potential
B)resting potential
C)threshold of excitation
D)reaction potential

Question 38

When a neuron is at rest,the inside of the neuron:

A)Is negatively charged with respect to the outside
B)Is positively charged with respect to the outside
C)Is not charged
D)Converts potential energy into chemical energy

Question 39

Motor neurons are typically ___ while sensory neurons are typically either ___ or ___ neurons.

A)unipolar,multipolar,bipolar
B)multipolar,unipolar,bipolar
C)bipolar,unipolar,bipolar
D)bipolar,multipolar,unipolar

Question 40

A(n)___ would be found bridging between a sensory neuron and a motor neuron in the spinal cord.

A)glial neuron
B)projection
C)interneuron
D)multipolar

Question 41

A brief,rapid reversal of the neuron's potential from -70mV to +30 or +40mV and back indicates:

A)Sustained membrane reversal
B)A hyperpolarization
C)An action potential
D)A refractory period

Question 42

The ___ is the neuron's means of transmitting information over long distances.

A)depolarizing potential
B)repolarization
C)action potential
D)graded potential

Question 43

Much to your delight,your family puts in a backyard swimming pool and your dog sips from it as it is filled with fresh water.However,much to his dismay,you throw a blue dye tablet in the deep end.As the blue dye slowly disperses from the deep end,your dog drinks farther and farther from where the dye is being introduced.Your dog changes his drinking places because of the blue dye's:

A)Electrostatic pressure.
B)Diffusion gradient
C)Force of diffusion
D)Different polarization of dye versus water

Question 44

The depolarization arriving at an axon from a dendrite is called a ___ potential because it can ___.

A)action,transmit information
B)graded,vary in speed
C)graded,vary in magnitude
D)ionic,trigger an action potential

Question 45

The force by which high concentrations of ions disperse away from each other and thus spread evenly through a solution is called:

A)Electrostatic pressure
B)Force of diffusion
C)Repulsion
D)The law of electrostatic repulsion

Question 46

___ tend to exit a neuron based on weaker electrostatic pressure than their force of diffusion.

A)Chloride ions
B)Sodium ions
C)Potassium ions
D)Protein anions

Question 47

In a resting neuron,which force pushes potassium ions into the cell?

A)The sodium-potassium pump
B)Diffusion
C)The action potential
D)Saltatory conduction

Question 48

The sodium-potassium pump accounts for ___ of the neuron's energy expenditure.

A)75%
B)40%
C)25%
D)10%

Question 49

___ would tend to move into the neuron based on both their electrostatic pressure and force of diffusion.

A)Chloride ions
B)Sodium ions
C)Potassium ions
D)Protein anions

Question 50

The term depolarization refers to:

A)A change in the resting neuron's polarity away from zero
B)A change in the resting neuron's polarity toward zero
C)Conduction of the graded potential
D)Changes in conduction capability in myelinated axons

Question 51

At the peak of the action potential,which of the following ionic movements restores the neuron to its resting potential?

A)Sodium ions move into the cell.
B)Potassium ions move into the cell.
C)Protein anions move out of the cell.
D)Potassium ions move out of the cell.

Question 52

The change in electrical charge from -70mV to the peak of the action potential is due to ___ and the change in electrical charge from the peak of +30 or +40mV back to -70mV is due to___.

A)inflow of chloride ions,outflow of sodium ions
B)inflow of potassium ions,outflow of sodium ions
C)inflow of sodium ions,outflow of sodium ions
D)inflow of sodium ions,outflow of potassium ions

Question 53

The condition in which ions of a similar charge repel each other and thus spread evenly through a solution is called:

A)Electrostatic pressure
B)The resting potential
C)Repulsion
D)The rate of diffusion

Question 54

Chloride ions and anions are most concentrated in the:

A)Intracellular fluid
B)Extracellular fluid
C)Extracellular and intracellular fluid,respectively
D)Depolarized fluid

Question 55

When depolarization of the cell membrane reaches threshold,which of the following occurs?

A)Opening of sodium ion channels
B)Opening of chloride ion channels
C)A negative shift in the resting potential
D)Opening of potassium ion channels

Question 56

While taking her GRE exam,LaFawnduh was concentrating so hard it almost hurt and the test left her feeling exhausted.A very large share of the energy LaFawnduh expended in her "mental efforts" was consumed by the ___ in her nervous system.

A)neurons
B)stress hormones
C)sodium-potassium pump
D)mitochondria

Question 57

The sodium-potassium pump forces ___sodium ions ___ the cell for every ___ potassium ions ___ the cell.

A)3,into,2,into
B)2,into,3,out of
C)3,out of,1,out of
D)3,out of,2,into

Question 58

If the partial depolarization arriving at an axon is sufficiently large,typically ___ or more,it can cause normally closed sodium ion channels to open.

A)5mV
B)40mV
C)30mV
D)10mV

Question 59

Potassium ions are most concentrated in the ___ fluid.

A)intracellular
B)extracellular
C)intracellular and extracellular
D)non-polarized

Question 60

The sodium-potassium pump forces sodium ions ___ the cell and potassium ions___ the cell.

A)into,into
B)into,out of
C)out of;out of
D)out of,into

Question 61

An action potential occurs at a specific strength for that neuron,regardless of the stimulus intensity;this is known as the:

A)Principle of mass action
B)All-or-none law
C)Rate law
D)Law of equipotentiality

Question 62

Which of the following concepts does the all-or-none law describe?

A)All dendrites must be hyperpolarized before a neuron fires.
B)All neurons in a nerve fire or none of them fires.
C)The size of an action potential does not depend on the stimulus that started it.
D)The frequency at which a neuron fires is independent of the intensity of the stimulus.

Question 63

When you feel the lingering numbness of the "local" the dentist gave you,the biopsychology student knows the effects are due to the chemical anesthetic effects of:

A)Blocking sodium ion channels
B)Preventing neurotransmitter release
C)Producing hyperpolarizations on an afferent neuron
D)Producing prolonged refractory periods

Question 64

Bob was given a general anesthetic;he knew that while most local anesthetics work by ___,this general anesthetic possibly ___.

A)opening chloride ion channels,opened potassium ion channels
B)blocking sodium ion channels,blocked potassium ion channels
C)blocking sodium ion channels,opened chloride ion channels
D)blocking sodium ion channels,opened potassium ion channels

Question 65

When an axon transmits action potentials:

A)Nothing physically moves down the axon
B)Electricity flows from one end of the axon to the other
C)Neurochemicals flow from one end of the axon to the other
D)The sodium-potassium pump pushes ions down the axon

Question 66

Tetrodotoxin is a deadly poison because it blocks:

A)Sodium ion channels
B)Potassium ion channels
C)TDT channels
D)Chloride ion channels

Question 67

Medical researchers are focusing on the toxins of cone snails for several novel treatments because of the toxin's effects on:

A)Sodium ion channels
B)Potassium ion channels
C)Neurotransmitter receptors
D)All of the above

Question 68

Partial depolarizations die out over a short distance;these depolarizations are known as:

A)Small scale potentials
B)Micro potentials
C)Graded potentials
D)Nano potentials

Question 69

Various toxins from snakes,scorpions,and fish are called ___ because of their sites of action.

A)neural blockers
B)neuroantagonists
C)neurotoxins
D)nociceptors

Question 70

Most local anesthetics work by ___;some general anesthetics have the effect of ___.

A)preventing neurons from depolarizing,increasing the hyperpolarization of neurons
B)putting axons to sleep,putting the brain to sleep
C)preventing concentration gradients,increasing electrical gradients
D)increasing the polarization of neurons,preventing depolarizing

Question 71

You will find very few sushi bars that will serve fugu because:

A)Few non-Japanese diners like the taste
B)It is far too expensive for most sushi shops to offer as regular fare
C)It can kill if carelessly prepared
D)It is a source of botulinum toxin

Question 72

Local anesthetics work via ___ while general anesthetics have the effect of ___.

A)attaching to and blocking potassium ion channels,opening sodium ion channels
B)attaching to and blocking sodium ion channels,opening potassium ion channels
C)opening TDT channels,blocking TDT channels
D)opening chloride ion channels,blocking potassium ion channels

Question 73

Sarah threw rocks of different sizes into a pond.Just as ripple size was a function of size of rock,graded potentials ___ as a function of stimulus intensity.

A)vary in inverse magnitude
B)vary along an exponential continuum
C)vary in magnitude
D)are a graded percentage

Question 74

As the snake that bit him slithered away,Captain Jones remembered that a poisonous species could kill by blocking either his ___ or his ___.

A)sodium ion channels,calcium ion channels
B)potassium ion channels,chloride ion channels
C)calcium ion channels,chloride ion channels
D)sodium ion channels,potassium ion channels

Question 75

An action potential from beginning to end lasts about:

A)1 second
B)1 millisecond
C)1 microsecond
D)10 milliseconds

Question 76

Graded potentials decreased in size as they spread;the term for this is:

A)Non-decremental
B)All or none
C)Decremental
D)Graded polarization

Question 77

The action potential spreads through an axon by:

A)Depolarizing adjacent membrane to threshold,triggering another action potential
B)Inflow of potassium ions and outflow of sodium ions
C)A non-decremental of graded potential
D)A decremental of graded potential

Question 78

Electricity flowing in power lines drops in voltage over distance,requiring your power company to use transformers to boost the voltage.This loss over distance is similar to the behavior of ___ potentials.

A)hyperpolarizing
B)non-decremental
C)action
D)graded

Question 79

Medical researchers are interested in the toxins of cone snails for potential new treatments for ___ as well as ___.

A)pain,cancer
B)addictions,pain relief
C)pain,epilepsy
D)epilepsy,addictions

Question 80

After learning about the suffering of people with untreatable chronic pain,Amanda was encouraged by what researchers are learning about:

A)New alternative mind-body interventions
B)Neuro-feedback
C)Cone snail toxins
D)Genetically modified botulinum toxin