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Human Physiology Laboratory (BIOL 3120 ) PEX-02-04 - Physio Ex 9.1

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Sandra Watson
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stimulus frequency refers to

University

University of Houston-Downtown

Course

Human Physiology Laboratory (BIOL 3120 )

Name: Steffany A. Rivera
Exercise 2: Skeletal Muscle Physiology: Activity 4: Tetanus in Isolated Skeletal Muscle Lab Report
Pre-lab Quiz Results
You scored 100% by answering 3 out of 3 questions correctly.
1. Stimulus frequency refers to

2. Which of the following distinguishes a state of unfused tetanus from a state of complete (fused) tetanus?
You correctly answered: d. Muscle tension increases and decreases during a state of unfused tetanus.
3. When the stimulus frequency reaches a value beyond which no further increases in force are generated by the muscle,
the muscle has reached its
You correctly answered: a. maximal tetanic tension.
Experiment Results
Predict Question:
Predict Question: As the stimulus frequency increases further, what will happen to the muscle tension and twitch
appearance with each successive stimulus? Will there be a limit to this response?

Stop & Think Questions:
What begins to happen at around 80 msec?

How does the trace at 130 stimuli/sec compare with the trace at 50 stimuli/sec?

How do the traces with 146–150 stimuli per second compare with the trace at 130 stimuli per second?

Post-lab Quiz Results
You scored 66% by answering 2 out of 3 questions correctly.
1. The term tetanus refers to

2. Which of the following distinguishes a state of unfused tetanus from a state of complete (fused) tetanus?

3. When the stimulus frequency reaches a value beyond which no further increases in force are generated by the muscle,
the muscle has reached its

Review Sheet Results
1. Describe how increasing the stimulus frequency affected the force developed by the isolated whole skeletal muscle in
this activity. How well did the results compare with your prediction?

2. Indicate what type of force was developed by the isolated skeletal muscle in this activity at the following stimulus
frequencies: at 50 stimuli/sec, at 140 stimuli/sec, and above 146 stimuli/sec.

3. Beyond what stimulus frequency is there no further increase in the peak force? What is the muscle tension called at this frequency?

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 Human Physiology Laboratory (BIOL 3120 ) PEX-02-04 - Physio Ex 9.1

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