Title | Physio Ex Exercise 2 Activity 4 |
---|---|
Author | Kai Daniels |
Course | Prin Of Anatomy & Physiology |
Institution | Grambling State University |
Pages | 6 |
File Size | 398.2 KB |
File Type | |
Total Downloads | 61 |
Total Views | 150 |
Download Physio Ex Exercise 2 Activity 4 PDF
3/5/2021
PhysioEx Exercise 2 Activity 4
PhysioEx Lab Report Exercise 2: Skeletal Muscle Physiology Activity 4: Tetanus in Isolated Skeletal Muscle Name: Kai Daniels Date: 5 March 2021 Session ID: session-c38db61e-ae77-eee6-afb9-01206c03aeff
Pre-lab Quiz Results You scored 100% by answering 3 out of 3 questions correctly. 1 Stimulus frequency refers to You correctly answered: the rate that stimulating voltage pulses are applied to an isolated whole skeletal muscle. 2 Which of the following distinguishes a state of unfused tetanus from a state of complete (fused) tetanus? You correctly answered: Muscle tension increases and decreases during a state of unfused tetanus. 3 When the stimulus frequency reaches a value beyond which no further increases in force are generated by the muscle, the muscle has reached its You correctly answered: maximal tetanic tension.
Experiment Results Predict Question 1 Predict Question: As the stimulus frequency increases further, what will happen to the muscle tension and twitch appearance with each successive stimulus? Will there be a limit to this response? Your answer: As the stimulus frequency increases, the muscle tension generated by each successive stimulus will increase. There will be a limit to this increase. Stop & Think Questions 1 What begins to happen at around 80 msec? You correctly answered: unfused tetanus develops. 2 How does the trace at 130 stimuli/sec compare with the trace at 50 stimuli/sec? https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act4/
1/6
3/5/2021
PhysioEx Exercise 2 Activity 4
You correctly answered: Fused tetanus develops at this greater stimulus frequency. 3 How do the traces with 146-150 stimuli per second compare with the trace at 130 stimuli per second? You correctly answered: Maximal tetanic tension develops with these very high stimulation frequencies. Experiment Data Voltage (v)
Length (mm)
Stimuli/sec
Act. Force
Pass. Force
Total Force
8.5
75
50
5.12
0
5.12
8.5
75
130
5.88
0
5.88
8.5
75
140
5.91
0
5.91
8.5
75
142
5.92
0
5.92
8.5
75
144
5.94
0
5.94
8.5
75
146
5.95
0
5.95
8.5
75
148
5.95
0
5.95
8.5
75
150
5.95
0
5.95
Stimuli/sec = 50 at 8.5 V
Stimuli/sec = 130 at 8.5 V
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act4/
2/6
3/5/2021
PhysioEx Exercise 2 Activity 4
Stimuli/sec = 140 at 8.5 V
Stimuli/sec = 142 at 8.5 V
Stimuli/sec = 144 at 8.5 V
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act4/
3/6
3/5/2021
PhysioEx Exercise 2 Activity 4
Stimuli/sec = 146 at 8.5 V
Stimuli/sec = 148 at 8.5 V
Stimuli/sec = 150 at 8.5 V
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act4/
4/6
3/5/2021
PhysioEx Exercise 2 Activity 4
Post-lab Quiz Results You scored 100% by answering 3 out of 3 questions correctly. 1 The term tetanus refers to You correctly answered: sustained muscle tension due to very frequent stimuli. 2 Which of the following distinguishes a state of unfused tetanus from a state of complete (fused) tetanus? You correctly answered: Muscle tension increases and decreases between different values for an unfused tetanus. 3 When the stimulus frequency reaches a value beyond which no further increases in force are generated by the muscle, the muscle has reached its You correctly answered: maximal tetanic tension.
Review Sheet Results 1 Describe how increasing the stimulus frequency affected the force developed by the isolated whole skeletal muscle in this activity. How well did the results compare with your prediction? Your answer: Increasing stimulus frequency increases muscle tension generated by each successive force however there will be a plateau. 2 Indicate what type of force was developed by the isolated skeletal muscle in this activity at the following stimulus frequencies: at 50 stimuli/sec, at 140 stimuli/sec, and above 146 stimuli/sec. https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act4/
5/6
3/5/2021
PhysioEx Exercise 2 Activity 4
Your answer: At 50 stimuli/sec, the force generated is in a state called unfused tetanus, the muscle tension increase and decrease at different values At 140 stimuli/sec, the force generated is in a state called complete (fused) tetanus, the muscle tension are not wavering anymore. At above 146 stimuli/sec, the force generated is in a state called maximal tetanic tension which means any higher frequency will not change the force generated. 3 Beyond what stimulus frequency is there no further increase in the peak force? What is the muscle tension called at this frequency? Your answer: Beyond 146 stimuli/sec, there is no further increase in the peak force. This muscle tension is called maximal tetanic tension.
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act4/
6/6...