1. What determines how much neurotransmitter is released into the synaptic cleft? A. The size of...
1. What determines how much neurotransmitter is released into the synaptic cleft?
A. The size of the end-plate potentials in the postsynaptic cell
B. The rate of neurotransmitter degradation in the synaptic cleft
C. Action potential frequency in the presynaptic neuron
D. The diameter of synaptic vesicles in the presynaptic neuron
2. Which of the following ions is necessary for exocytosis of synaptic vesicles?
A.Calcium ions
B.Potassium ions
C.Magnesium ions
D.Sodium ions
Homework Answers
1. C) Action potential frequency in the presynaptic neuron.
Increase in intensity of stimulus -> Increase in frequency of action potential -> Increase neurotransmitter release.
Other options clearly seem illogical in this context as they are not at all related to the neurotransmitter release.
2. A) Ca2+
When an action potential depolarizes the presynaptic plasma membrane, Ca2+-channels open, and Ca2+ flows into the nerve terminal to trigger the exocytosis of synaptic vesicles, thereby releasing their neurotransmitters into the synaptic cleft.
No other ions are involved in this process.
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Thank you!!!
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GABAB receptors (GABABRs) are
G-protein-coupled receptors that can be found on both pre- and
postsynaptic neurons. When they are activated by GABA, they can
have a range of effects. For the synapse you are studying in the
following questions, the effects of GABABRs are
indicated in IMAGE G.
You are doing a series of experiments in which you are recording
from the pre- and postsynaptic cell at a synapse. The experiments
described below...
The right answer is (D)
Please explain. I don't understand how K+ could be effluxing rather
than influxing
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