Phisioex 9 Skeletal Muscle
hysioEx 9.0 – Exercise 2: Skeletal Muscle Physiology Name:
Chart 1: Latent Period Results
Voltage Active force (g) Latent period (msec)
0.0 0.00 XXXXXXXXXX
3.0 1.04 XXXXXXXXXX
4.0 1.32 2.40
6.0 1.65 2.40
8.0 1.81 2.40
10.0 1.81 2.40
Chart 2: Effect of Stimulus Voltage on Skeletal Muscle Contraction
Voltage Active force (g)
0.0 0.00
0.2 0.00
0.8 0.02
1.0 .15
1.5 .43
2.0 .66
2.5 .87
3.0 1.64
3.5 1.19
4.0 1.32
4.5 1.42
5.0 1.51
5.5 1.59
6.0 1.65
6.5 1.70
7.0 1.74
7.5 1.78
8.0 1.81
8.5 1.82
9.0 1.82
9.5 1.82
10.0 1.82
Chart 3: Effect of Stimulus Frequency on Skeletal Muscle Contraction
Voltage Stimulus Active Force (g)
8.5 Single 1.83
8.5 Multi 2.40
8.5 Multi 3.00
8.5 Multi 4.22
10 Multi 3.65
8.5 Multi 5.72
Chart 4: Tetanus in Isolated Skeletal Muscle
Stimuli/sec Active Force (g)
50 5.12
130 5.88
140 5.91
142 5.94
144 5.94
146 5.95
148 5.95
150 5.95
Chart 5: Fatigue Results
Rest Period Active Force (g) Sustained maximal force
(sec)
8.5 5.86 10
8.5 5.86 10
8.5 5.86 .60
8.5 5.86 5.0
Chart 6: Skeletal Muscle Length-Tension Relationship
Length
(mm) Active
Force (g) Passive
Force (g) Total force (g)
Chart 7: Isotonic Contraction Results
Weight (g) Velocity
(cm/sec) Twitch duration (msec) Distance lifted (cm)
Activity 1: The Muscle Twitch and the Latent Period
1) Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period. multinucleated contractile cells varying from less than 10–100 mcm in diameter and from less than 1 mm to several centimeters in length; the fiber consists of sarcoplasm and cross-striated myofibrils, which in turn consist of myofilaments; human skeletal muscles are a mixture of red, white, and intermediate type fibers
a single somatic motor neuron and the group of muscle fibers innervated by it.
The mechanical response to a
Chart 1: Latent Period Results
Voltage Active force (g) Latent period (msec)
0.0 0.00 XXXXXXXXXX
3.0 1.04 XXXXXXXXXX
4.0 1.32 2.40
6.0 1.65 2.40
8.0 1.81 2.40
10.0 1.81 2.40
Chart 2: Effect of Stimulus Voltage on Skeletal Muscle Contraction
Voltage Active force (g)
0.0 0.00
0.2 0.00
0.8 0.02
1.0 .15
1.5 .43
2.0 .66
2.5 .87
3.0 1.64
3.5 1.19
4.0 1.32
4.5 1.42
5.0 1.51
5.5 1.59
6.0 1.65
6.5 1.70
7.0 1.74
7.5 1.78
8.0 1.81
8.5 1.82
9.0 1.82
9.5 1.82
10.0 1.82
Chart 3: Effect of Stimulus Frequency on Skeletal Muscle Contraction
Voltage Stimulus Active Force (g)
8.5 Single 1.83
8.5 Multi 2.40
8.5 Multi 3.00
8.5 Multi 4.22
10 Multi 3.65
8.5 Multi 5.72
Chart 4: Tetanus in Isolated Skeletal Muscle
Stimuli/sec Active Force (g)
50 5.12
130 5.88
140 5.91
142 5.94
144 5.94
146 5.95
148 5.95
150 5.95
Chart 5: Fatigue Results
Rest Period Active Force (g) Sustained maximal force
(sec)
8.5 5.86 10
8.5 5.86 10
8.5 5.86 .60
8.5 5.86 5.0
Chart 6: Skeletal Muscle Length-Tension Relationship
Length
(mm) Active
Force (g) Passive
Force (g) Total force (g)
Chart 7: Isotonic Contraction Results
Weight (g) Velocity
(cm/sec) Twitch duration (msec) Distance lifted (cm)
Activity 1: The Muscle Twitch and the Latent Period
1) Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period. multinucleated contractile cells varying from less than 10–100 mcm in diameter and from less than 1 mm to several centimeters in length; the fiber consists of sarcoplasm and cross-striated myofibrils, which in turn consist of myofilaments; human skeletal muscles are a mixture of red, white, and intermediate type fibers
a single somatic motor neuron and the group of muscle fibers innervated by it.
The mechanical response to a