Physioex 8.0 exercise #2 activity

asaralequi

wrote...

13 years ago

If anyone can help me with these it would be greatly appreciated. My assignment is due tomorrow and I need help!!! Neutral Face

Activity 3: Effects of increases in stimulus intensity

2.How did the increase in voltage affect the amount of active force generated by the muscle?

Activity 6: Tetanus

1. what begins at around 80 msec?
2. What is this condition called?
3. How does the trace at 130 stimuli/sec compare with the trace at 50 stimuli/sec?
4. What is this condition called?
5. At what stimulus frequency is there no further increase in force?
6. what is this stimulus called?

Activity 7: Fatigue

1. In fatigue, what happens to the force production over time?

Activity 8: Isometric Contractions

4. The graph shows a dip at muscle length = 90 mm. why is this?
5. What is the key in the isometric contraction?

Activity 9: Isotonic Contractions

1. How much time does it take for the muscle to generate 0.5 grams of force?
2. At what point in the trace does the muscle shorten?
3. you can observe from the trace that the muscle is rising in force before it reaches the plateau phase. why doesn't the muscle shorten prior to the plateau phase?
4. Did it tale any longer for the muscle to reach it needed to move the weight?
5. How does the trace differ from the trace you generated with the .5 gram weight attached?
6. Examine the plot data and your numerical data. At what weight was the velocity of the contraction the fastest?
7. What happened when you attached the 2.0 gram weight to the muscle and stimulated the muscle? how did this trace differ from the other traces? what kind of contraction did you observe?
8. What kind of trace did you get?
9. What was the force of the contraction?
10. With the 1.0 gram weight, what kind of trace did you get? what was the force of the contraction?
11. With the 1.5 gram weight, what kind of trace did you get? what was the contraction?
12. With the 2.0 gram weight, what kind of trace did you get? what was the contraction?
13. Describe you four tracings and explain what has happened in each of them.
14. What muscle length(s) generated the fastest contraction velocity?

PLEASE HELP Undecided

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gibson Author

wrote...

13 years ago

1.   How did the increases in voltage affect the peaks in the tracings? As the voltage increased the peaks began to get more dramatic. At first the peaks were subtle, only making a ‘hill’. But as the voltage increased the lines now resembled a ‘mountain’, peaking high then dropping back down.
2.   How did the increases in voltage affect the amount of active force generated by the muscle? As the voltage increased, the active force increased as well. It started at 0.0 jumping to 1.82 at 8.5 V and then stayed at 1.82 for the rest of the exercise.
3.   What is the voltage beyond which there were no further increases in active force? Maximal voltage: 8.5 V
4.   Why is there a maximal voltage? What has happened to the muscle at this voltage? The reason for a max voltage is because this is when the muscle is working to its fullest potential using every fiber to contract. If the muscle were to respond to a higher V, the muscle would become damaged. So at 8.5, in this case, the muscle was using all of the muscle fibers, unlike before where it was only using some of it’s fibers to contract. This is where the muscle meets it full potential.
5.   An individual muscle fiber follows the all-or-none principle—it will either contract 100% or not at all. Does the muscle we are working with exhibit the all-or-none principle? Why or why not? The muscle we are working with is not just one fiber it is many fibers. While an individual does work on the all- or- one principle, our ‘unit’ of fibers does not. When the ‘unit’ of fibers is stimulated the ‘unit’ responds to the stimulus and as our experiment shows, not all fiber will respond if it has not met its threshold. Only when the threshold stimulates the ‘unit’ will ALL the fibers respond.

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bio_man

wrote...

Educator

13 years ago

Excellent post, Gibson, thank you.

asaralequi, your assignment is due on Easter day?

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asaralequi Author

wrote...

13 years ago

Ya, it is an online class and assignments are due every sunday : /

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