Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter8: Muscle Physiology
Section: Chapter Questions
Problem 2TAHL
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Question
Muscle Contraction
In an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with one muscle fibre is observed in this experiment. One end of the muscle fibre is attached to a mass. The following data were obtained from the experiment.
Number of Trials | Strength of Stimulus (mV) | Mass Lifted by Muscle Contraction (g) |
---|---|---|
1 | 20 | 0 |
2 | 40 | 0 |
3 | 60 | 50 |
4 | 80 | 50 |
5 | 100 | Not Tested |
6 | 120 | 50 |
Identify the manipulated, responding and controlled variables in the experiment described above.
Strength of Stimulus |
|
Number of Muscle Fibre Stimulated |
|
Mass Lifted by Muscle Contraction |
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