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Physiology Week 7

QuestionAnswer
What mechanism quickly terminates the action of a neurotransmitter once it binds to its postsynaptic receptor? Neurotransmitter molecules are transported into nearby glial cells, Neurotransmitter molecules are transported back into synaptic knobs, Neurotransmitter molecules are metabolized into inactive compounds.
The mechanisms that produce and maintain the resting membrane potential do so by producing a slight excess of positive ions on the outer surface of the plasma membrane.
If the threshold potential is surpassed, the full peak of the action potential is always reached. True
The sodium-potassium pump actively pumps three potassium ions out of the neuron and two sodium ions into the neuron. False
In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier. True
Movement of the membrane potential away from zero (below the usual RMP) is called hyperpolarization
Stimulus-gated channels open in response to: sensory stimuli.
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
Severe depression can be caused by a deficit in certain brain synapses of: amines.
Which of the following is true of spatial summation? Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron.
Dopamine, epinephrine, and norepinephrine are classified as: catecholamines.
The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are): enkephalins.
Serotonin is an example of a(n): amine neurotransmitter
Acetylcholine is in the same class of neurotransmitters as: none of the above.
Created by: SionStoner
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