26-5-2021 PhysioEx Exercise 2 Activity 6
PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology
Activity 6: The Skeletal Muscle Length-Tension Relationship
Name:
Date:
Session ID:
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1 During an isometric contraction
You correctly answered: the skeletal muscle is generating force, but it remains at a fixed length.
2 The force that results from muscles being stretched is
You correctly answered: passive force.
3 Active force
You correctly answered: is determined by the amount of myosin bound to actin.
4 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.
5 Passive force in skeletal muscle is largely caused by You correctly answered: the protein titin.
Experiment Results
Predict Question
1 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.
Stop & Think Question
1 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.
Experiment Data
Voltage (v) Length (mm) Active Force Passive Force Total Force
8.5 75 1.82 0 1.82
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/15/ex2/act6/ 1/15
, 26-5-2021 PhysioEx Exercise 2 Activity 6
8.5 70 1.75 0 1.75
8.5 65 1.55 0 1.55
8.5 60 1.21 0 1.21
8.5 55 0.73 0 0.73
8.5 50 0.11 0 0.11
8.5 80 1.75 0.02 1.77
8.5 90 1.21 0.25 1.46
8.5 100 0.11 1.75 1.86
Muscle Length = 70 mm
Active Force = 1.75
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/15/ex2/act6/ 2/15
PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology
Activity 6: The Skeletal Muscle Length-Tension Relationship
Name:
Date:
Session ID:
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1 During an isometric contraction
You correctly answered: the skeletal muscle is generating force, but it remains at a fixed length.
2 The force that results from muscles being stretched is
You correctly answered: passive force.
3 Active force
You correctly answered: is determined by the amount of myosin bound to actin.
4 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.
5 Passive force in skeletal muscle is largely caused by You correctly answered: the protein titin.
Experiment Results
Predict Question
1 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.
Stop & Think Question
1 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.
Experiment Data
Voltage (v) Length (mm) Active Force Passive Force Total Force
8.5 75 1.82 0 1.82
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/15/ex2/act6/ 1/15
, 26-5-2021 PhysioEx Exercise 2 Activity 6
8.5 70 1.75 0 1.75
8.5 65 1.55 0 1.55
8.5 60 1.21 0 1.21
8.5 55 0.73 0 0.73
8.5 50 0.11 0 0.11
8.5 80 1.75 0.02 1.77
8.5 90 1.21 0.25 1.46
8.5 100 0.11 1.75 1.86
Muscle Length = 70 mm
Active Force = 1.75
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/15/ex2/act6/ 2/15
