PhysioEx Exercise 2 Activity 6
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2/6/24, 1:50 PM
PhysioEx Exercise 2 Activity 6
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PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology
Activity 6: The Skeletal Muscle Length-Tension Relationship
Name: Sophie Vanderkallen
Date: 6 February 2024
Session ID: session-e64cf587-cf67-2739-102d-182749161ec7
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
Experiment Results
Predict Question
Stop & Think Question
During an isometric contraction
You correctly answered: the skeletal muscle is generating force, but it remains at a fixed
length.
1
The force that results from muscles being stretched is
You correctly answered: passive force.
2
Active force
You correctly answered: is determined by the amount of myosin bound to actin.
3
When you generate the isometric length-tension curve, which of the following forces will not
be indicated on your screen?
You correctly answered: tetanic force.
4
Passive force in skeletal muscle is largely caused by
You correctly answered: the protein titin.
5
Predict Question: As the resting length of the muscle is changed, what will happen to the
amount of total force the muscle generates during the stimulated twitch?
Your answer: Total force can increase or decrease depending upon the starting resting
length.
1
2/6/24, 1:50 PM
PhysioEx Exercise 2 Activity 6
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Experiment Data
Post-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
Review Sheet Results
Note the dip in total force at a muscle length of 90 mm as compared to the total force at a
muscle length of 80 and 100 mm. Why does this occur?
You correctly answered: At this muscle length, active force has decreased in value and
passive force has not yet increased to a significant value.
1
When a skeletal muscle is stimulated and generates force but remains at a fixed length
You correctly answered: the muscle is contracting isometrically.
1
Which protein is mostly responsible for the development of passive force in a muscle?
You correctly answered: titin.
2
In skeletal muscle, active force stimulated through a range of muscle lengths
You correctly answered: will utilize ATP hydrolysis to drive the cross bridge cycle.
3
Which of the following is not
depicted in a typical skeletal muscle isometric length-tension
curve?
You correctly answered: time.
4
Maximal active tension will be produced in a skeletal muscle fiber when
You correctly answered: the fiber is at its resting length.
5
What happens to the amount of total force the muscle generates during the stimulated
twitch? How well did the results compare with your prediction?
Your answer:
correct.
1
What is the key variable in an isometric contraction of a skeletal muscle?
Your answer:
muscle length.
2
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