Fluorescent FM dyes partition reversibly into biological membranes without penetrating through them. Suppose that you have neurons cultured in a dish. You incubate the neurons with an FM dye, and then you wash them with medium to remove the dye.

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3. Fluorescent FM dyes partition reversibly into biological membranes without
penetrating through them. Suppose that you have neurons cultured in a dish. You
incubate the neurons with an FM dye, and then you wash them with medium to
remove the dye.
a) You find that if the neurons are stimulated to trigger action potentials during
incubation with the dye, the synaptic regions of the neurons remain fluorescent
after the wash. Propose an explanation for this effect.
b) After generating fluorescent synaptic regions by this procedure, suppose that you
trigger additional action potentials while continuing to wash with medium. Would
you expect the synaptic regions to lose fluorescence? Explain.
 
 
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