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SCI221-10Diwana Doty
Week 7 - Nerve Signaling
| Question | Answer |
|---|---|
| For a neurotransmitter to produce an inhibitory postsynaptic potential, which of the following channels must open? | Potassium and/or chloride channels |
| Neurotransmitters are released in a synapse and bind to: | receptors on the postsynaptic neuron |
| The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body | Almost 300 times faster |
| Acetylcholine is in the same class of neurotransmitters as: | serotonin. histamine. dopamine. Correct Answer none of the above. |
| A synapse consists of: | a synaptic knob. a synaptic cleft. the plasma membrane of a postsynaptic neuron. CORRECT ANSWER: all of the above. |
| When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called: | saltatory conduction. |
| Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)? | Phenelzine |
| During a relative refractory period: | the action potential can be initiated with a strong stimulus. |
| Which is true of an action potential? | The outside of the plasma membrane is negatively charged, and the inside is positively charged. |
| Stimulus-gated channels open in response to | sensory stimuli. |
| Within the nervous system, coding for the strength of a stimulus is accomplished through: | the frequency of nerve impulses. |
| When an impulse reaches a synapse | chemical transmitters are released |
| The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. | 130 |
| A synaptic knob would be located on a(n): | axon. |
| Which of the following is not one of the main chemical classes of neurotransmitters? | Triglycerides |
| The first event to occur when an adequate stimulus is applied to a neuron is: | some of the sodium channels at the point of stimulation open |
| Which neuron could transmit a nerve impulse the fastest? | A large-diameter neuron with myelin |
| Dopamine, epinephrine, and norepinephrine are classified as | catecholamines |
| Excitatory neurotransmitters are most likely to: | initiate an action potential |
| Which of the following statements about amino acid neurotransmitters is incorrect? | They are all inhibitory neurotransmitters |
| Which is true of a neuron with a resting potential? | The sodium pump has moved Na+ to the outside of the plasma membrane |
| No impulse can be sent through a neuron | during the absolute refractory period |
| Which of the following is true of spatial summation? | Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron. |
| The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are): | enkephalins |
| Which of the following is not used by the body as a neurotransmitter? | Nitric oxide Acetylcholine Carbon monoxide Correct Answer All of the above are used by the body as neurotransmitters. |
| Serotonin is an example of a(n): | amine neurotransmitter |
| Compared with the outside of the neuron, the inside has a(n) ____ charge. | negative |
| Severe depression can be caused by a deficit in certain brain synapses of | amines |
| A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential | local |
| The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are): | potassium |
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DiwanaD
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