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Name: pspd6

Exercise 2: Skeletal Muscle Physiology: Activity 6: The Skeletal Muscle Length-Tension Relationship Lab Report

Pre-lab Quiz Results

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Experiment Results

Predict Question:

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 : d. An increase in muscle length will decrease the total force.

Stop & Think Questions:

Note the dip in total force at a muscle length of90 mm as compared to the total force at a muscle length of 80 and 100 mm. Why does this occur?

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Correct answer: d. At this muscle length, active force has decreased in value and passive force has not yet increased to a

significant value.

Experiment Data:

Voltage Length Active Force Passive Force Total Force

8.5 75 1.82 0.0 1.82

8.5 70 1.75 0.0 1.75

8.5 65 1.55 0.0 1.558.5 60 1.21 0.0 1.21

8.5 55 0.73 0.0 0.73

8.5 50 0.11 0.0 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

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Review Sheet Results

1. What happens to the amount of total force the muscle generates during the stimulated twitch? How well did the results

compare with your prediction?

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2. What is the key variable in an isometric contraction of a skeletal muscle?

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3. Based on the unique arrangement of myosin and actin in skeletal muscle sarcomeres, explain why active force varies

with changes in the muscle's resting length.

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4. What skeletal muscle lengths generated passive force? (Provide a range.)

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5. If you were curling a 7-kg dumbbell, when would your bicep muscles be contracting isometrically?

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