physLab2.docx - Lab#2 Neuromuscular Reflexes Introduction...

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Lab #2: Neuromuscular Reflexes Introduction: In this lab, we studied the comparison of voluntary activation versus an involuntary reflex muscle action. We also measured the amplitude of stimulus-generated impulses with and without reinforcement and estimated nerve impulse speed. Finally, in our extension, we studied the difference between muscle contraction time and stimulus time when the subject is watching and not watching the patellar tendon strike. We hypothesized that voluntary action would take longer than involuntary reflex, that reinforcement would slow reflex time, and that watching the strike would result in faster reflex. Materials: A brief overview of the probes utilized and procedures preformed We used electrode tabs paired with the Vernier EKG Sensors and 25-g Accelerometers to measure muscle activity. We also used Labquest to analyze the data, a reflex hammer to strike the patellar tendon, a pen to mark strike spots on Tessa’s leg, and a cable tie to keep cords and hammers from getting in each other’s way. We also used a cloth tape measure in our extension
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