Test
Study Guide: Nerve Signaling
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Preguntas del test (55)
1Compared with the inside of the cell, the outside of most cell membranes is
- Apositive
- Bnegative
- Cequal
- Dnone of the above
2The difference in electrical charge across a plasma membrane is called
- Aa. depolarization
- Bb. membrane potential
- Cc. both a and b
- Dd. none of the above
3A neuron's resting membrane potential is
- A70 mV
- B-70 mV
- C30 mV
- D-30 mV
4Which of the following statements is true concerning the sodium-potassium pump?
- AThree sodium ions are pumped out of the neuron for every two potassium ions pumped into the neuron.
- BTwo sodium ions are pumped out of the neuron for every three potassium ions pumped into the neuron.
- CThree sodium ions are pumped out of the neuron for every three chloride ions pumped into the neuron.
- DThree sodium ions are pumped out of the neuron for every three potassium ions pumped into the neuron.
5A membrane that exhibits a membrane potential is said to be polarized.
- AVerdadero
- BFalso
6A slight shift away from the resting membrane potential in a specific region of the plasma membrane is often called a stimulus-gated channel.
- AVerdadero
- BFalso
7Chlorine ions are the dominant extracellular cations
- AVerdadero
- BFalso
8During a relative refractory period
- Aan action potential is impossible
- Ban action potential is possible only in response to a very strong stimuli
- Can action potential is occurring
- Dnone of the above
9Voltage-gated channels are
- Amembrane channels that close during voltage fluctuations
- Bion channels that open in response to voltage fluctuations
- Cmembrane channels that are altered from an extremely high stimulus
- Dnone of the above
10The larger the diameter of a nerve fiber
- Athe slower the speed of conduction
- Bthe faster the speed of conduction
- CFiber diameter does not influence speed of conduction
- Dthe more the speed fluctuates
11Action potential and nerve impulse are synonymous
- AVerdadero
- BFalso
12When repolarization has occurred, an impulse can't be conducted
- AVerdadero
- BFalso
13The action potential is an all-or-none response
- AVerdadero
- BFalso
14Many anesthetics function by inhibiting the opening of sodium channels and thus blocking the initiation and conduction of nerve impulses
- AVerdadero
- BFalso
15Which of the following structures is not a main component of a chemical synapse?
- Asynaptic knob
- Bsynaptic cleft
- Csynaptic proces
- Dplasma membrane of postsynaptic neuron
16A synaptic knob is located on the
- Asynaptic cleft
- Baxon
- Cdendrite
- Dcell body
17Which of the following is true of spatial summation?
- ANuerotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron.
- BSimultaneous stimulation of more than one postsynaptic neuron occurs.
- CImpulses are fired in a rapid succession by the same neuron.
- DSpeed of impulse transmission is increased when several neurotransmitters are released
18In an adult, the nervous system is replete with both electrical synapses and chemical synapses.
- AVerdadero
- BFalso
19Rapid-succession stimulation of a postsynaptic neuron by a synaptic knob can have a cumulative effect over time that can result in an action potential.
- AVerdadero
- BFalso
20Ca++ ions cause the release of neurotransmitters across the synaptic cleft.
- AVerdadero
- BFalso
21Neurotransmitters are released in a synapse and bind to
- Apresynaptic terminals
- Bthe synaptic cleft
- Cthe base of the axon
- Dthe receptors on the postsynaptic terminal
22The main chemical classes of neurotransmitters include all of the following except
- Aacetylcholine
- Bnorepinephrine
- Camino acids
- Damine
23Which of the following is not an example of an amine neurotransmitter?
- Aserotonin
- Bhistamine
- Cglycine
- Ddopamine
24Severe depression can be caused by a deficit in which of the following neurotransmitters?
- Aacetylcholine
- Bamino acids
- Camines
- Dneuropeptides
25Which of the following is not a catecholamine?
- Aepinephrine
- Bnorepinephrine
- Cdopamine
- Dserotonin
26Many biologists now believe that neuropeptides are the most common neurotransmitters in the CNS.
- AVerdadero
- BFalso
27Cocaine produces a temporary feeling of well-being by blocking the uptake of dopamine.
- AVerdadero
- BFalso
28Neuroscience 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].
- Areticular
- Btheory
29The concentration of neurotransmitters at synapses in certain neural pathways can affect [blank_start]health[blank_end].
- Ahealth
30[blank_start]Neurotrophins[blank_end] are nerve growth factors that are released by various cells of the body.
- ANeurotrophins
31When more than one presynaptic axon synapses with a single postsynaptic neuron, [blank_start]convergence[blank_end] occurs.
- Aconvergence
32When a single presynaptic axon synapses with many different postsynaptic neurons, [blank_start]divergence[blank_end] occurs.
- Adivergence
33Multiple sclerosis is a myelin disorder.
- AVerdadero
- BFalso
34Physical injury, causing nerve damage, can cause local or widespread loss of sensation and/or motor control.
- AVerdadero
- BFalso
35Nerve conduction does not occur due to fluctuations in the concentration of ions.
- AVerdadero
- BFalso
36Myasthenia gravis is a bacterial disorder.
- AVerdadero
- BFalso
37Parkinson disease is a failure to release adequate dopamine at the synapse of certain motor pathways.
- AVerdadero
- BFalso
38A synaptic knob is a tiny bulge at the end of the [blank_start]presynaptic[blank_end] neuron's axon.
- Apresynaptic
- Bpostsynaptic
39Acetylcholine is an example of a [blank_start]neurotransmitter[blank_end].
- Aneurotransmitter
- Bprotein molecule receptor
40Neurotransmitters are chemicals that allow neurons to [blank_start]communicate[blank_end] with one another.
- Acommunicate
- Breproduce
41Neurotransmitters are distributed [blank_start]specifically[blank_end] into groups of neurons.
- Aspecifically
- Brandomly
42Endorphins and enkephalins are neurotransmitters that inhibit conduction of [blank_start]pain[blank_end].
- Apain
- Bfear
43A synonym commonly used for action potential is [blank_start]nerve impulse[blank_end].
- Anerve impulse
- Bdepolarization
44In 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].
- Asaltatory conduction
- Bpostsynaptic conduction
45A membrane that exhitbits a membrane potential is said to be [blank_start]polarized[blank_end].
- Apolarized
- Bmyelinated
46A wave of electrical fluctuation that travels along the plasma membrane is called a [blank_start]nerve[blank_end] [blank_start]impulse[blank_end].
- Anerve
- Bimpulse
47The 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].
- Aresting
- Bmembrane
- Cpotential
48Movement of the membrane potential away from zero (thus below the usual RMP) is called [blank_start]hyperpolarization[blank_end].
- Ahyperpolarization
49Three 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]
- Aplasma
- Bmembrane
- Cof
- Da
- Epostsynaptic
- Fneuron
- Gsynaptic
- Hknob
- Isynaptic
- Jcleft.
50Long-term memories (months or years) require [blank_start]structural[blank_end] changes in the synapse, such as more vesicles or more vesicle release sites.
- Astructural
51The unique neurotransmitter that combines acetate with choline is acetylcholine. It is deactivated by [blank_start]acetylcholinesterase[blank_end].
- Aacetylcholinesterase
52An example of a catecholamine is [blank_start]dopamine[blank_end].
- Adopamine
53Two major function classifications of neurotransmitters are excitatory neurotransmitters and [blank_start]inhibitory[blank_end] [blank_start]neurotransmitters[blank_end].
- Ainhibitory
- Bneurotransmitters
54The function of a neurotransmitter is determined by the postsynaptic receptor.
- AVerdadero
- BFalso
55Nuetotrophins stimulate neuron development but also can act as neurotransmitters or neuromodulators.
- AVerdadero
- BFalso
Información
- Descripción
- Study Guide: Nerve Signaling
- Autor
- Alexandra Bozan
- Idioma
- English
- Visitas
- 24
- Etiquetas
- Valoración
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