Lab 6 Worksheet - Lab 6 Worksheet Muscle Stimulation In...

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Lab 6 Worksheet: Muscle Stimulation In this exercise, you will use an oscilloscope to examine the effect of varying load (weight) on frog skeletal muscle action. To begin, click on the pull down menu of the “Muscle” button to select the type of muscle you would first like to test. Making sure that the oscilloscope is set to “0.0 V”, click the “Apply Stimulus” button. As you do so, pay close attention to the trace readout on the screen; you are looking specifically for a spike in the straight line to be produced. If no spike is observed, use the upward pointing arrow on the oscilloscope to increase the voltage to the next highest level and then click “Apply Stimulus”. Keep repeating this procedure until you observe the production of a spike in the oscilloscope trace readout. At that point, note the voltage in the “0g” load weight for that muscle in Table 1 and round all values to the 1 st (tenths) decimal place. NOTE: If no spike is observed, be sure to click “Apply Stimulus” at least 3 times to make sure the muscle received the stimulus properly. Table 1: Threshold Stimulus (V) Load Lower Forelimb Muscle Upper Forelimb Muscle Calf Muscle Thigh Muscle 0g 2.0 V 3.0 V 5.0 V 6.0 V 5g 3.0 V 4.0 V 5.5 V 6.5 V 10g 4.0 V 5.0 V 6.0 V 7.0 V 20g None 7.0 V 7.0 V 8.0 V 40g None None 8.0 V 9.0 V 80g None None None 10.0 V Lab Questions: 1. Smooth muscle: a. Is voluntary b.Is found in the heart c. Is found in lining the intestines d.All of the above 2. Skeletal muscle: a. Is involuntary b. Is made up of muscle fibers c. Is attached to bone via ligaments d.All of the above 3. In skeletal muscle: a. The greater the number of muscle fibers responding to a stimulus, the greater the strength of the contraction b.the fewer the number of muscle fibers responding to a stimulus, the greater the strength of the contraction
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c.
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  • Winter '11
  • Dr.Keiter
  • Calf Muscle

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