Consider a postsynaptic neuron that receives input from two other neurons, one v
ID: 3510734 • Letter: C
Question
Consider a postsynaptic neuron that receives input from two other neurons, one via an electrical synapse and the other through a chemical synapse.
a. Would there be a difference in the time of the postsynaptic response to action potentials that arrived at the two presynaptic terminals at the same time? [0.25 pts]
i. No
ii. Yes, sooner after activation of the chemical synapse
iii. Yes, sooner after activation of the electrical synapse
b. Would there be a change the postsynaptic response due to activation of the electrical synapse if the extracellular Ca2+ was removed? [0.25 pts]
i. No
ii. Yes, it would increase in amplitude
iii. Yes, it would decrease in amplitude
iv. Yes, there would be no postsynaptic potential
c. Would there be a change in the postsynaptic response due to activation of the chemical synapse if the extracellular Ca2+ is removed? [0.25 pts]
i. No
ii. Yes, it would increase in amplitude
iii. Yes, it would decrease in amplitude
iv. Yes, there would be no postsynaptic potential
d. Would either presynaptic neuron be influenced by the injection of a depolarizing current into the postsynaptic neuron? [0.25 pts]
i. Neither presynaptic neuron would be affected
ii. Yes, the presynaptic neuron with the chemical synapse would be depolarized
iii. Yes, the presynaptic neuron with the electrical synapse would be depolarized
iv. Yes, both neurons would be depolarized
Explanation / Answer
A. iii yes sooner after activation of electric synapse.
B. iv yes there would be no postsynaptic potential.
C. i NO (for explanation read previous answer).
D. iii yes the presynaptic neuron with electric synapse would be depolarized.
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