PhysioEx Exercise 2 Activity 2
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Date
Feb 20, 2024
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11
Uploaded by CoachFogQuetzal37
10/27/22, 2:58 PM
PhysioEx Exercise 2 Activity 2
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act2/
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PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction Name: Selvana Labib Date: 27 October 2022 Session ID: session-24d9b988-536e-9d71-57aa-2a19c6d851a6 Pre-lab Quiz Results
You scored 75% by answering 3 out of 4 questions correctly.
Experiment Results
Predict Question
Stop & Think Questions
Skeletal muscle fibers are innervated (stimulated) by
You correctly answered: motor neurons.
1
A single action potential propagating down a motor axon results in
Your answer: a single action potential and several contractile events in the muscle fibers it
innervates.
Correct answer: a single action potential and a single contractile event in the muscle fibers it
innervates.
2
In resting skeletal muscle, calcium is stored in
You correctly answered: the sarcoplasmic reticulum.
3
During the latent period for an isometric contraction
You correctly answered: the cellular events involved in excitation-contraction coupling occur.
4
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 continually increase.
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?
1
10/27/22, 2:58 PM
PhysioEx Exercise 2 Activity 2
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Experiment Data
Voltage (v)
Length (mm)
Active Force
Passive Force
Total Force
0.0
75
0.00
0.00
0.00
0.2
75
0.00
0.00
0.00
0.8
75
0.02
0.00
0.02
1.0
75
0.15
0.00
0.15
1.5
75
0.43
0.00
0.43
2.0
75
0.66
0.00
0.66
2.5
75
0.87
0.00
0.87
3.0
75
1.04
0.00
1.04
3.5
75
1.19
0.00
1.19
4.0
75
1.32
0.00
1.32
4.0
75
1.32
0.00
1.32
4.5
75
1.42
0.00
1.42
5.0
75
1.51
0.00
1.51
5.5
75
1.59
0.00
1.59
6.0
75
1.65
0.00
1.65
6.5
75
1.70
0.00
1.70
7.0
75
1.74
0.00
1.74
7.5
75
1.78
0.00
1.78
8.0
75
1.81
0.00
1.81
8.5
75
1.82
0.00
1.82
9.0
75
1.82
0.00
1.82
9.5
75
1.82
0.00
1.82
10.0
75
1.82
0.00
1.82
You correctly answered: 0.00; there was no activation of skeletal muscle fibers by this
stimulus.
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
10/27/22, 2:58 PM
PhysioEx Exercise 2 Activity 2
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Voltage = 0.0 V
Voltage = 0.2 V
Voltage = 0.8 V
Voltage = 1.0 V
10/27/22, 2:58 PM
PhysioEx Exercise 2 Activity 2
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act2/
4/11
Voltage = 1.5 V
Voltage = 2.0 V
Voltage = 2.5 V
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