8236741
Descrição
Quiz por Alexandra Bozan, atualizado more than 1 year ago
|
|
Criado por Alexandra Bozan
aproximadamente 7 anos atrás
|
|
Questão 1
Questão
Compared with the inside of the cell, the outside of most cell membranes is
Responda
-
positive
-
negative
-
equal
-
none of the above
Questão 2
Questão
The difference in electrical charge across a plasma membrane is called
Responda
-
a. depolarization
-
b. membrane potential
-
c. both a and b
-
d. none of the above
Questão 3
Questão
A neuron's resting membrane potential is
Responda
-
70 mV
-
-70 mV
-
30 mV
-
-30 mV
Questão 4
Questão
Which of the following statements is true concerning the sodium-potassium pump?
Responda
-
Three sodium ions are pumped out of the neuron for every two potassium ions pumped into the neuron.
-
Two sodium ions are pumped out of the neuron for every three potassium ions pumped into the neuron.
-
Three sodium ions are pumped out of the neuron for every three chloride ions pumped into the neuron.
-
Three sodium ions are pumped out of the neuron for every three potassium ions pumped into the neuron.
Questão 5
Questão
A membrane that exhibits a membrane potential is said to be polarized.
Responda
- True
- False
Questão 6
Questão
A slight shift away from the resting membrane potential in a specific region of the plasma membrane is often called a stimulus-gated channel.
Responda
- True
- False
Questão 7
Questão
Chlorine ions are the dominant extracellular cations
Responda
- True
- False
Questão 8
Questão
During a relative refractory period
Responda
-
an action potential is impossible
-
an action potential is possible only in response to a very strong stimuli
-
an action potential is occurring
-
none of the above
Questão 9
Questão
Voltage-gated channels are
Responda
-
membrane channels that close during voltage fluctuations
-
ion channels that open in response to voltage fluctuations
-
membrane channels that are altered from an extremely high stimulus
-
none of the above
Questão 10
Questão
The larger the diameter of a nerve fiber
Responda
-
the slower the speed of conduction
-
the faster the speed of conduction
-
Fiber diameter does not influence speed of conduction
-
the more the speed fluctuates
Questão 11
Questão
Action potential and nerve impulse are synonymous
Responda
- True
- False
Questão 12
Questão
When repolarization has occurred, an impulse can't be conducted
Responda
- True
- False
Questão 13
Questão
The action potential is an all-or-none response
Responda
- True
- False
Questão 14
Questão
Many anesthetics function by inhibiting the opening of sodium channels and thus blocking the initiation and conduction of nerve impulses
Responda
- True
- False
Questão 15
Questão
Which of the following structures is not a main component of a chemical synapse?
Responda
-
synaptic knob
-
synaptic cleft
-
synaptic proces
-
plasma membrane of postsynaptic neuron
Questão 16
Questão
A synaptic knob is located on the
Responda
-
synaptic cleft
-
axon
-
dendrite
-
cell body
Questão 17
Questão
Which of the following is true of spatial summation?
Responda
-
Nuerotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron.
-
Simultaneous stimulation of more than one postsynaptic neuron occurs.
-
Impulses are fired in a rapid succession by the same neuron.
-
Speed of impulse transmission is increased when several neurotransmitters are released
Questão 18
Questão
In an adult, the nervous system is replete with both electrical synapses and chemical synapses.
Responda
- True
- False
Questão 19
Questão
Rapid-succession stimulation of a postsynaptic neuron by a synaptic knob can have a cumulative effect over time that can result in an action potential.
Responda
- True
- False
Questão 20
Questão
Ca++ ions cause the release of neurotransmitters across the synaptic cleft.
Responda
- True
- False
Questão 21
Questão
Neurotransmitters are released in a synapse and bind to
Responda
-
presynaptic terminals
-
the synaptic cleft
-
the base of the axon
-
the receptors on the postsynaptic terminal
Questão 22
Questão
The main chemical classes of neurotransmitters include all of the following except
Responda
-
acetylcholine
-
norepinephrine
-
amino acids
-
amine
Questão 23
Questão
Which of the following is not an example of an amine neurotransmitter?
Responda
-
serotonin
-
histamine
-
glycine
-
dopamine
Questão 24
Questão
Severe depression can be caused by a deficit in which of the following neurotransmitters?
Responda
-
acetylcholine
-
amino acids
-
amines
-
neuropeptides
Questão 25
Questão
Which of the following is not a catecholamine?
Responda
-
epinephrine
-
norepinephrine
-
dopamine
-
serotonin
Questão 26
Questão
Many biologists now believe that neuropeptides are the most common neurotransmitters in the CNS.
Responda
- True
- False
Questão 27
Questão
Cocaine produces a temporary feeling of well-being by blocking the uptake of dopamine.
Responda
- True
- False
Questão 28
Questão
Neuroscience has advanced to a point at which the neuron doctrine has been expanded to include concepts of the [blank_start]reticular[blank_end] [blank_start]theory[blank_end].
Responda
-
reticular
-
theory
Questão 29
Questão
The concentration of neurotransmitters at synapses in certain neural pathways can affect [blank_start]health[blank_end].
Responda
-
health
Questão 30
Questão
[blank_start]Neurotrophins[blank_end] are nerve growth factors that are released by various cells of the body.
Responda
-
Neurotrophins
Questão 31
Questão
When more than one presynaptic axon synapses with a single postsynaptic neuron, [blank_start]convergence[blank_end] occurs.
Responda
-
convergence
Questão 32
Questão
When a single presynaptic axon synapses with many different postsynaptic neurons, [blank_start]divergence[blank_end] occurs.
Responda
-
divergence
Questão 33
Questão
Multiple sclerosis is a myelin disorder.
Responda
- True
- False
Questão 34
Questão
Physical injury, causing nerve damage, can cause local or widespread loss of sensation and/or motor control.
Responda
- True
- False
Questão 35
Questão
Nerve conduction does not occur due to fluctuations in the concentration of ions.
Responda
- True
- False
Questão 36
Questão
Myasthenia gravis is a bacterial disorder.
Responda
- True
- False
Questão 37
Questão
Parkinson disease is a failure to release adequate dopamine at the synapse of certain motor pathways.
Responda
- True
- False
Questão 38
Questão
A synaptic knob is a tiny bulge at the end of the [blank_start]presynaptic[blank_end] neuron's axon.
Responda
-
presynaptic
-
postsynaptic
Questão 39
Questão
Acetylcholine is an example of a [blank_start]neurotransmitter[blank_end].
Responda
-
neurotransmitter
-
protein molecule receptor
Questão 40
Questão
Neurotransmitters are chemicals that allow neurons to [blank_start]communicate[blank_end] with one another.
Responda
-
communicate
-
reproduce
Questão 41
Questão
Neurotransmitters are distributed [blank_start]specifically[blank_end] into groups of neurons.
Responda
-
specifically
-
randomly
Questão 42
Questão
Endorphins and enkephalins are neurotransmitters that inhibit conduction of [blank_start]pain[blank_end].
Responda
-
pain
-
fear
Questão 43
Questão
A synonym commonly used for action potential is [blank_start]nerve impulse[blank_end].
Responda
-
nerve impulse
-
depolarization
Questão 44
Questão
In myelinated fibers, action potentials in the membrane occur only at the nodes of Ranvier. This type of impulse conduction is called [blank_start]saltatory conduction[blank_end].
Responda
-
saltatory conduction
-
postsynaptic conduction
Questão 45
Questão
A membrane that exhitbits a membrane potential is said to be [blank_start]polarized[blank_end].
Responda
-
polarized
-
myelinated
Questão 46
Questão
A wave of electrical fluctuation that travels along the plasma membrane is called a [blank_start]nerve[blank_end] [blank_start]impulse[blank_end].
Responda
-
nerve
-
impulse
Questão 47
Questão
The membrane potential maintained by a nonconducting neuron's plasma membrane is called the [blank_start]resting[blank_end] [blank_start]membrane[blank_end] [blank_start]potential[blank_end].
Responda
-
resting
-
membrane
-
potential
Questão 48
Questão
Movement of the membrane potential away from zero (thus below the usual RMP) is called [blank_start]hyperpolarization[blank_end].
Responda
-
hyperpolarization
Questão 49
Questão
Three structures make up a chemical synapse. They are [blank_start]plasma[blank_end] [blank_start]membrane[blank_end] [blank_start]of[blank_end] [blank_start]a[blank_end] [blank_start]postsynaptic[blank_end] [blank_start]neuron[blank_end], [blank_start]synaptic[blank_end] [blank_start]know[blank_end] and the [blank_start]synaptic[blank_end] [blank_start]cleft.[blank_end]
Responda
-
plasma
-
membrane
-
of
-
a
-
postsynaptic
-
neuron
-
synaptic
-
knob
-
synaptic
-
cleft.
Questão 50
Questão
Long-term memories (months or years) require [blank_start]structural[blank_end] changes in the synapse, such as more vesicles or more vesicle release sites.
Responda
-
structural
Questão 51
Questão
The unique neurotransmitter that combines acetate with choline is acetylcholine. It is deactivated by [blank_start]acetylcholinesterase[blank_end].
Responda
-
acetylcholinesterase
Questão 52
Questão
An example of a catecholamine is [blank_start]dopamine[blank_end].
Responda
-
dopamine
Questão 53
Questão
Two major function classifications of neurotransmitters are excitatory neurotransmitters and [blank_start]inhibitory[blank_end] [blank_start]neurotransmitters[blank_end].
Responda
-
inhibitory
-
neurotransmitters
Questão 54
Questão
The function of a neurotransmitter is determined by the postsynaptic receptor.
Responda
- True
- False
Questão 55
Questão
Nuetotrophins stimulate neuron development but also can act as neurotransmitters or neuromodulators.
Responda
- True
- False
Quer criar seus próprios Quizzes gratuitos com a GoConqr? Saiba mais.