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Kathleen Maravillas

PHYSIOLOGY WEEK 7-13

Within the nervous system, coding for the strength of a stimulus is accomplished through: A. changes in the magnitude of the action potential. B. changes in the length or duration of the action potential. C. the frequency of nerve impulses. D. an increase C. THE FREQUENCY OF NERVE IMPULSES.
Which is true of a neuron with a resting potential? A. The cell membrane is permeable to Na+ but impermeable to K+ ions. B. The outer surface of the plasma membrane has a negative charge. C. The highest concentration of K+ is extracellular. D. The sod D. The sodium pump has moved Na+ to the outside of the plasma membrane.
Which of the following is not used by the body as a neurotransmitter? A. Nitric oxide B. Acetylcholine C. Carbon monoxide D. All of the above are used by the body as neurotransmitters. D. All of the above are used by the body as neurotransmitters.
Serotonin is an example of a(n): A. amino acid neurotransmitter. B. amine neurotransmitter. C. acetylcholine derivative. D. neuropeptide neurotransmitter. B. amine neurotransmitter.
The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are): acetylcholine. enkephalins. dopamine. norepinephrine. enkephalins.
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
The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. 60 85 130 190 130
Acetylcholine is in the same class of neurotransmitters as: serotonin. histamine. dopamine. none of the above. none of the above.
Dopamine, epinephrine, and norepinephrine are classified as: acetylcholine. neuropeptides. catecholamines. none of the above. catecholamines.
The first event to occur when an adequate stimulus is applied to a neuron is: the membrane potential moves immediately to a value of +30 mV. the potassium channels open. the sodium channels are inactivated. some of the sodium channels at the poi some of the sodium channels at the point of stimulation open.
Severe depression can be caused by a deficit in certain brain synapses of: acetylcholine. amines. amino acids. neuropeptides. AMINES
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.
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
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.
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.
Stimulus-gated channels open in response to: sensory stimuli. the influx of potassium. hyperpolarization. both A and B. sensory stimuli.
Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)? Phenelzine Imipramine Amitriptyline Cocaine Phenelzine
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.
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
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.
Which of the following statements about amino acid neurotransmitters is incorrect? They are among the most common neurotransmitters in the central nervous system (CNS). They are all inhibitory neurotransmitters. Glycine is a widely distributed inhibi They are all inhibitory neurotransmitters.
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.
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 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 negat The outside of the plasma membrane is negatively charged, and the inside is positively charged.
A synaptic knob would be located on a(n): cell body. axon. dendrite. cell body, axon, or dendrite. axon.
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.
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.
Compared with the outside of the neuron, the inside has a(n) ____ charge. positive negative equal None of the above are correct. negative
Which of the following is not one of the main chemical classes of neurotransmitters? Triglycerides Amines Amino acids Neuropeptides Triglycerides
The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body? Almost 50 times faster Almost 100 times faster Almost 300 times faster Almost 500 times faster Almost 300 times faster
Created by: kmaravillas
 

 



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