In the neuron of the last question, if Ca2+ channels were to open on the axon, i
ID: 3473627 • Letter: I
Question
In the neuron of the last question, if Ca2+ channels were to open on the axon, in which direction would the ion flow and what would happen to the membrane potential?
(the last question was What is the equilibrium potential for calcium ions across a squid neuronal membrane at room temperature (so NOT a mammalian neuron) if the extracellular concentration is 1 mM and the intracellular concentration is 0.0001 mM?)
Ca efflux depolarizes the membrane
Ca influx hyperpolarizes the membrane
There is no net movement of Ca so the potential does not change
Ca influx depolarizes the membrane
Ca influx hyperpolarizes the membrane
a.Ca efflux depolarizes the membrane
b.Ca influx hyperpolarizes the membrane
c.There is no net movement of Ca so the potential does not change
d.Ca influx depolarizes the membrane
e.Ca influx hyperpolarizes the membrane
Explanation / Answer
The squid neuronal membrane has Calcium receptors present on it. The Calcium will move along the gradient in the cell and acts on the receptors. This process leads to release of neurotransmitters by the neuron for the post-synaptic neuron. This is similar to what happens in nerve depolarization. So the correct answer is d. Calcium influx depolarizes the membrane.
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