2/6/24, 1:10 PM
PhysioEx Exercise 2 Activity 2
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Experiment Data
Post-lab Quiz Results
You scored 100% by answering 6 out of 6 questions correctly.
What is the lowest stimulus voltage that induces active force in the skeletal muscle?
You correctly answered: threshold voltage.
2
Enter the threshold voltage for this experiment.
You answered: 0.8 volts.
3
Enter the maximal voltage for this experiment.
You answered: 8.5 volts.
4
Motor unit recruitment refers to
You correctly answered: an increase in the number of active muscle fibers to increase the
force developed in a muscle.
1
Active tension (or force) in a skeletal muscle fiber results from
You correctly answered: activation of cross bridge cycling via increased intracellular calcium
levels.
2
The is the minimal stimulus needed to cause a depolarization of the muscle plasma
membrane (sarcolemma).
You correctly answered: threshold voltage.
3
By definition, the is the amount of stimulus required to successfully recruit all
the
muscle fibers into developing active force.
You correctly answered: maximal voltage.
4
Why was a maximal voltage observed in this experiment?
You correctly answered: At the maximal voltage, all the muscle fibers contained in this
muscle are depolarized and they all develop active force (that is, they were all successfully
recruited).
5
A sufficiently strong electrical stimulus applied to an isolated, mounted skeletal muscle
induces the development of muscle force, or muscle tension. Which of the following
statements concerning this observation is true
?
6
