Show transcribed image text Previous Problem List Next (1 point) When the brain sends a signal, it passes an electrical charge from one neuron to another. Prior to the signal and well after the signal, the voltage across the space between neurons is flat, but during a brief period the voltage spikes. A model for voltage near the spike can be given by 0.3 n(t)1- ifo Toe ift>t in volts (V), where η is a negative constant and t* is a constant representing the time (in ms) at which the signal is triggered. The "critical voltage" is the value of η(t) when the signal is triggered, that is, when t = t". (a) What is the value of the membrane voltage 1 ms before the signal is triggered? volts. volts. (b) What is the value of the critical voltage? Nata: YaU Gan earn partial credit on this problerm