exercise 2 skeletal muscle physiology activity 2 the effect of stimulus voltage on skeletal muscle contraction
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Universiteit Antwerpen (UA)
Farmaceutische Wetenschappen
Inleiding Fysiologie En Functionele Anatomie I (1008FBDFAR)
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26-5-2021 PhysioEx Exercise 2 Activity 2
PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology
Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction
Name:
Date:
Session ID:
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly. 1
Skeletal muscle fibers are innervated (stimulated) by
You correctly answered: motor neurons.
2 A single action potential propagating down a motor axon results in
You correctly answered: a single action potential and a single contractile event in the muscle fibers it
innervates.
3 In resting skeletal muscle, calcium is stored in
You correctly answered: the sarcoplasmic reticulum.
4 During the latent period for an isometric contraction
You correctly answered: the cellular events involved in excitation-contraction coupling occur.
Experiment Results
Predict Question
1 Predict Question: As the stimulus voltage is increased from 1.0 volt up to 10 volts, what will happen
to the amount of active force generated with each stimulus?
Your answer: The active force will first increase and then plateau at some maximal value as the
stimulus voltage increases.
Stop & Think Questions
1 What do you observe in the active force display when the stimulus voltage is set to 0.0, and why
does this observation make sense?
You correctly answered: 0.00; there was no activation of skeletal muscle fibers by this stimulus.
2 What is the lowest stimulus voltage that induces active force in the skeletal muscle?
You correctly answered: threshold voltage.
3 Enter the threshold voltage for this experiment.
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