An era is a commonly used word for a long period of time. When used in science, for example geology, an era denotes a clearly defined period of time of arbitrary but well-defined length, such as for example the Mesozoic Era from 252 Maâ66 Ma, delimited by a start event and an end event.
As you increase voltage to the muscle describe how it responds to the increased stimulus. As the voltage was increased from threshold to maximum voltage, there was a greater force in the muscle contraction. Once the maximum voltage (2500 mv) was reached, even if there was an increase in voltage, the force of the muscle contraction remained the same.
Lower the stimulus voltage until muscle twitch is first absent. In the stimulator control panel, select âSet Number of Pulsesâ, then set the value to â2â; set the interval to 2 msec (500 Hz) ; set the duration and strength (amplitude/intensity) of the second stimulus equal to that of the first.Click âOKâ.urpose: A) As with the nerve experiments, one of your goals in this first procedure is to determine the response of the muscle to various stimuli so that you can employ a relatively constant stimulus protocol during the remaining experiments.