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