(Solved): A myelinated axon is covered with myelin sheath in between each two nodes. At one node (x=0), an ac ...

A myelinated axon is covered with myelin sheath in between each two nodes. At one node $$(x=0)$$, an action potential is created and the membrane potential changes by $${\mathrm{V}}_N$$ due to $$\mathrm{Na}$$ inflow. The Na ions diffuse ALONG the axon within the myelinated part and the voltage decays along the axon as $$\mathrm{V}(\mathrm{x})={\mathrm{V}}_{\mathrm{A}}{e}^{?x\mathrm{s}}$$, where $$?$$ is the space constant (see the figure). [Hint: The graph shows how spread the action potential is along the axon from the position of the action potential $$(x=0)$$. Think: What should be the membrane potential at the position, $$x=?$$ ?] Reading from the graph, if $$\mathrm{V}(\mathrm{x})$$ for this axon is shown as the curve "a", the space constant for this axon is: $$?=$$ Answel $$?\mathrm{m}$$.