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VIRTUAL MUSCLE STIMULATION ACTIVITYGoogle “virtual from muscle physiology lab” and choose the mhhe websiteRead the Purpose and Objectives of the activity. Click on the blue Information button on the bottom right. Answer the following questions:1. Contrast voluntary and involuntary muscles. Include what types of muscles are in each category and where these muscles are found.2. What attaches muscle to bones? 3. What is the “all or none” law of muscle contraction? 4. How is the strength of the muscle contraction determined? 5. Define a muscle twitch: 6. Define a muscle’s “threshold of stimulation:” 7. Define the “point of muscle overload:” Finish reading the information and then close the Information window. Follow the Procedure and record your data in the Table below. After you finish the experiment, answer the Analysis questions. Table I: Threshold Stimulus (V)LoadLower Forelimb MuscleUpper Forelimb MuscleCalf MuscleThigh Muscle0g5g10g20g40g80gGraph your results:ANALYSIS:1. Based on the results of your investigation, what conclusions can you draw about the relationship between a muscle's workload and its threshold of stimulation?2. Why would a muscle's threshold of stimulation change as its Workload changes?3. Which muscles were able to contract under the greatest loads? What does this suggest about the role these muscles play in frog movement?4. Describe an experiment you might perform to determine which leg muscles of a frog are important for jumping long distances.5. What are some advantages of performing this experiment in a simulated environment?Post-laboratory Questions: Smooth muscle: Is voluntaryIs found in the heartIs found in lining the intestinesAll of the above Skeletal muscle: Is involuntaryIs made up of muscle fibersIs attached to bone via ligamentsAll of the aboveIn skeletal muscle: The greater the number of muscle fibers responding to a stimulus, the greater the strength of the contractionthe fewer the number of muscle fibers responding to a stimulus, the greater the strength of the contractionthe actual number of muscle fibers responding to a stimulus has no effect on the strength of the contraction An oscilloscope: Provides stimulus to a tested muscleAdds weight (load) to a tested muscleMeasures a twitch response of a tested muscleA and CAll of the aboveAt the point of muscle overload: Skeletal muscle contracts steadily (tetany)Skeletal muscle contracts and relaxes repeatedlySkeletal muscle does not contract at all A skeletal muscle’s “threshold of stimulation”: Is determined by the lowest voltage stimulus needed to elicit a muscle twitchVaries with muscle typeIs not altered by the application of muscle loadB and C In response to a stimulus, skeletal muscle fibers: Always contract to 25% of their potential abilityAlways contract to 50% of their potential abilityAlways contract 100% of their potential abilityNone of the aboveBased upon your experimental data, which muscle type exhibited the lowest threshold of stimulation in all conditions tested? Lower forelimb muscleUpper forelimb muscleCalf muscle Thigh muscle Based upon your experimental data, which muscle type(s) did not reach the point of muscle overload? Lower forelimb muscleUpper forelimb muscleCalf muscle Thigh muscle Based upon your experimental data, which muscle tested appears most capable to provide the contraction strength needed for a frog to jump? Lower forelimb muscleUpper forelimb muscleCalf muscleThigh muscle ................
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