11/2/2020 PhysioEx Exercise 2 Activity 6
PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology
Activity 6: The Skeletal Muscle Length-Tension Relationship
Name: Sarah Rodriguez
Date: 2 November 2020
Session ID: session-a6c627c0-6f65-953e-e9cf-6a845b119f41
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
i
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act6/ 1/11
, 11/2/2020 PhysioEx Exercise 2 Activity 6
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
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 = 75 mm
Active Force = 1.82
Passive Force = 0
Total Force = 1.82
Active Force
Muscle Length = 75 mm
Passive Force
Total Force Active Force = 1.82
Passive Force = 0
Total Force = 1.82
i
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act6/ 2/11
PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology
Activity 6: The Skeletal Muscle Length-Tension Relationship
Name: Sarah Rodriguez
Date: 2 November 2020
Session ID: session-a6c627c0-6f65-953e-e9cf-6a845b119f41
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
i
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act6/ 1/11
, 11/2/2020 PhysioEx Exercise 2 Activity 6
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
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 = 75 mm
Active Force = 1.82
Passive Force = 0
Total Force = 1.82
Active Force
Muscle Length = 75 mm
Passive Force
Total Force Active Force = 1.82
Passive Force = 0
Total Force = 1.82
i
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act6/ 2/11
