Week 7 Nerve Signaling
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. | show 🗑
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| show | Phenelzine
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| show | catecholamines.
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| Which of the following statements about amino acid neurotransmitters is incorrect? They are all inhibitory neurotransmitters. | show 🗑
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| show | receptors on the postsynaptic neuron.
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| Which of the following is not used by the body as a neurotransmitter? Nitric oxide Acetylcholine Carbon monoxide All of the above are used by the body as neurotransmitters. | show 🗑
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| show | A large-diameter neuron with myelin
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| show | None of the above
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| show | Almost 300 times faster
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| The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are): | show 🗑
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| The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are): | show 🗑
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| For a neurotransmitter to produce an inhibitory postsynaptic potential, which of the following channels must open? | show 🗑
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| show | the action potential can be initiated with a strong stimulus.
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| Which is true of a neuron with a resting potential? | show 🗑
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| show | during the absolute refractory period.
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| Within the nervous system, coding for the strength of a stimulus is accomplished through: | show 🗑
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| When an impulse reaches a synapse: | show 🗑
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| show | amine neurotransmitter.
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| Compared with the outside of the neuron, the inside has a(n) ____ charge | show 🗑
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| show | saltatory conduction.
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| Excitatory neurotransmitters are most likely to: | show 🗑
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| Which of the following is not one of the main chemical classes of neurotransmitters? | show 🗑
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| show | all of the above.
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| show | Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron.
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| show | Local
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| show | The outside of the plasma membrane is negatively charged, and the inside is positively charged.
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| The first event to occur when an adequate stimulus is applied to a neuron is | show 🗑
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| show | sensory stimuli
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| show | axon
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| Severe depression can be caused by a deficit in certain brain synapses of: | show 🗑
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| show | False
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| The sodium-potassium pump actively pumps three potassium ions out of the neuron and two sodium ions into the neuron. FALSE | show 🗑
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| the action potential seems to “leap” from node to node along a myelinated fiber. This type of impulse regeneration is called __________ conduction. | show 🗑
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| A term commonly used as a synonym for action potential is | show 🗑
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| A neurologist is using a voltmeter to measure potential. The membrane potential of a neuron was recorded at +30 mV. This is what type of membrane potential? | show 🗑
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| In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier. TRUE | show 🗑
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| The membrane potential maintained by a nonconducting neuron’s plasma membrane is called the _____ membrane potential. | show 🗑
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| show | True
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| When neurotransmitters from synaptic knobs stimulate a postsynaptic neuron in rapid succession, their effect can add up over a brief period to produce an action potential. This is called | show 🗑
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| show | Refractory
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| show | ALL CORRECT
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| If the magnitude of the local depolarization surpasses a limit called the _____, voltage-gated Na+ channels are stimulated to open. | show 🗑
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| show | chemical
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| In depolarization the membrane potential moves toward zero, whereas in hyperpolarization the membrane potential moves away from zero. TRUE | show 🗑
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| If the threshold potential is surpassed, the full peak of the action potential is always reached. TRUE | show 🗑
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| show | sodium-potassium pump.
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| Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes. FALSE | show 🗑
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| show | Gated-channel receptor
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| Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. TRUE | show 🗑
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| show | synaptic knob.
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| show | MEMBRANE POTENTIAL
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| The mechanisms that produce and maintain the resting membrane potential do so by producing a | show 🗑
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| show | sodium causes depolarization of the cell membrane, and potassium causes repolarization of the cell membrane.
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| show | ANY OF THE ABOVE
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| show | FALSE
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| show | TRUE
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| Which chemicals allow neurons to communicate with one another? | show 🗑
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| show | polarized
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| show | hyperpolarization.
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| An ion channel that opens in response to a sensory stimulus is a(n) | show 🗑
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Created by:
Crystal C
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