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Question

Which of the following is true of spatial summation?

Simultaneous stimulation of more than one postsynaptic neuron occurs.
Impulses are fired in a rapid succession by the same neuron.
Neurotransmitters released simultaneously from several presynaptic
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Question

Which neuron could transmit a nerve impulse the fastest?
A small-diameter neuron without myelin

A large-diameter neuron without myelin

A large-diameter neuron with myelin

A small-diameter neuron with myelin
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week 7

physiology

QuestionAnswer
Which of the following is true of spatial summation? Simultaneous stimulation of more than one postsynaptic neuron occurs. Impulses are fired in a rapid succession by the same neuron. Neurotransmitters released simultaneously from several presynaptic Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron.
Which neuron could transmit a nerve impulse the fastest? A small-diameter neuron without myelin A large-diameter neuron without myelin A large-diameter neuron with myelin A small-diameter neuron with myelin A large-diameter neuron with myelin
Acetylcholine is in the same class of neurotransmitters as: Group of answer choices serotonin. histamine. dopamine. none of the above. none of the above
Within the nervous system, coding for the strength of a stimulus is accomplished through: changes in the magnitude of the action potential. changes in the length or duration of the action potential. the frequency of nerve impulses. an increase the frequency of nerve impulses.
Dopamine, epinephrine, and norepinephrine are classified as: Group of answer choices acetylcholine. neuropeptides. catecholamines. none of the above. catecholamines.
The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body? Group of answer choices Almost 50 times faster Almost 100 times faster Almost 300 times faster Almost 500 times faster Almost 300 times faster
Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)? Group of answer choices Phenelzine Imipramine Amitriptyline Cocaine Phenelzine
Serotonin is an example of a(n): Group of answer choices amino acid neurotransmitter. amine neurotransmitter. acetylcholine derivative. neuropeptide neurotransmitter. amine neurotransmitter.
Which of the following is not used by the body as a neurotransmitter? Group of answer choices Nitric oxide Acetylcholine Carbon monoxide All of the above are used by the body as neurotransmitters. All of the above are used by the body as neurotransmitters.
Which is true of an action potential? The plasma membrane is impermeable to Na+ and K+ ions. Na+ ions move extracellularly. The charges become equal on the outside and inside of the plasma membrane. The outside of the plasma membrane is negative The outside of the plasma membrane is negatively charged, and the inside is positively charged.
A synapse consists of: a synaptic knob. a synaptic cleft. the plasma membrane of a postsynaptic neuron. all of the above. all of the above.
A synaptic knob would be located on a(n): Group of answer choices cell body. axon. dendrite. cell body, axon, or dendrite. axon
Compared with the outside of the neuron, the inside has a(n) ____ charge. positive negative equal None of the above are correct. negative
The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. Group of answer choices 60 85 130 190 130???
Severe depression can be caused by a deficit in certain brain synapses of: acetylcholine. amines. amino acids. neuropeptides. amines
The first event to occur when an adequate stimulus is applied to a neuron is: membrane potential moves immediately to a value of +30 mV. potassium channels open. sodium channels are inactivated. some of the sodium channels at the point of stimul some of the sodium channels at the point of stimuli
During a relative refractory period: the action potential cannot be initiated. a resting potential exists. the cell membrane is impermeable to Na+ and K+. the action potential can be initiated with a strong stimulus. the action potential can be initiated with a strong stimulus.
When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called: repolarization. refraction. saltatory conduction. diffusion. saltatory conduction.
Excitatory neurotransmitters are most likely to: increase the speed of impulse conduction. make the cell membrane impermeable. initiate an action potential. make the resting potential more negative. initiate an action potential.
A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential. membrane resting membrane local None of the above is correct. local
No impulse can be sent through a neuron: during the relative refractory period. when the charge of the neuron is –70. during the absolute refractory period. when the stimulus is too strong. during the absolute refractory period?
Neurotransmitters are released in a synapse and bind to: presynaptic terminals. the synaptic cleft. the base of the axon. receptors on the postsynaptic neuron. receptors on the postsynaptic neuron.
The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are): sodium. potassium. proteins. phosphate. potassium.
Which of the following is not one of the main chemical classes of neurotransmitters? Triglycerides Amines Amino acids Neuropeptides Triglycerides
For a neurotransmitter to produce an inhibitory postsynaptic potential, which of the following channels must open? Sodium and potassium channels Potassium and/or chloride channels Sodium and chloride channels Only the sodium channels Potassium and/or chloride channels
When an impulse reaches a synapse: two nerve fibers come in direct contact. impulses will pass in either direction. an electrical spark will jump the gap. chemical transmitters are released. chemical transmitters are released.
Whats true of a neuron with a resting potential? cell membrane is permeable to Na+ but impermeable to K+ ions outer surface of the plasma membrane has a negative charge highest concentration of K+ is extracellular sodium pump has moved Na+ to the out The sodium pump has moved Na+ to the outside of the plasma membrane.
Which of the following statements about amino acid neurotransmitters isnt true are among the most common neurotransmitters in the central nervous system. are all inhibitory neurotransmitters. Glycine is a widely distributed inhibitory neurot all all of the above are correct
The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are): acetylcholine. enkephalins. dopamine. norepinephrine. enkephalins.
Stimulus-gated channels open in response to: sensory stimuli. the influx of potassium. hyperpolarization. both A and B. sensory stimuli.
Created by: destinyyrobinson
 

 



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