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wrote...
Donated
Valued Member
12 years ago
This is great Smiling Face with Open Mouth Thanks for an informative posting.
wrote...
12 years ago
any chance you were able to finish the rest of the responses? they were very helpful! thanks!
wrote...
12 years ago
Don't how to get U the screen shots, but I can help with the answers!


7-1: Why does the force begin to decrease with time? Note that a decrease in force indicates muscle fatigue. (Hint: think about what a muscle needs to contract). 
The force began to decrease because there are only a few ATP molecules available for the contraction part in the muscle cells.

7-2: Turning the stimulator off allows a small measure of recovery. The muscle will produce force for a longer period if the stimulator is briefly turned off than if the stimulations were allowed to continue without interruption. Explain why. 
Because when the stimulator is turned off, the muscle is able to rest a moment, allowing it to ATP’s too catch up, which in turn will allow it to continue producing force before the muscle began to fatigue.

7-3: Describe the difference between the current tracing and the myogram generated in step 6.
The current tracing shows rapid muscle fatigue than when the stimulator was turned on and off in step 6.

8-1: What happens to the passive and active forces as the muscle length is increased from 50 mm to 100 mm? Specifically, discuss what the force looks like at particular lengths - at what lengths did the force show large increases or decreases.
Passive force: 
As the muscle length was being increased from 50mm to 100mm, the passive force basically stayed 0.00 until the muscle length reach 80mm.  Once the muscle got to 80mm, the muscle began to show increases in passive force but not much.  Then when the muscle reached 84mm, the muscle began to show larger increases in passive force.   
Active force:
As soon as the first contraction started, the active force began showing large increases and continued to steadily increase until the muscle length got to 75mm, and then the force started to show large decreases as the muscle lengths increased.   
Total force:
As the muscle length is being stretched from 50mm to 100mm, the total force is showing large amounts of increases.  Once the muscle length reaches 76mm the total force starts to quickly decrease, but starts to show large increases again at 94mm causing a dip in the total force.

8-2: Explain the dip in the total force curve. (Hint: Keep in mind you are measuring the sum of active and passive forces). 

I need the answer also!!!

9-1: What do you see happening to the muscle during the flat part of the tracing? Click "Stimulate" to repeat if you wish to see the muscle action again. 
During the flat part of the tracing, the muscle rises from the platform and then falls again.

9-2: Does the force the muscle produces change during the flat part of the tracing (increase, decrease, or stay the same)? 
The force the muscle produces stays the same during the flat part of the tracing.

9-3: Which of the two weights used so far results in the highest initial velocity of shortening?
Weight___1.5__ g
Velocity __0.45____mm/sec

9-4: Repeat step 6 for the remaining two weights:
Weight __1.0___g
Velocity__1.34___ mm/sec

Weight ___2.0__g
Velocity ___0.00__mm/sec

9-5: What does the plot reveal about the relationship between resistance and the initial velocity of shortening? Increased resistance causes __shorter_______________ (shorter, longer, the same - choose one) initial velocity of shortening.

9-6: Describe the relationship between starting length and initial velocity of shortening.
As the starting length of the muscle is increased from 60mm to 90mm, the initial velocity of shortening first increases and then decreases.


wrote...
Staff Member
12 years ago
MEKAYLA, thanks for sharing this.
- Master of Science in Biology
- Bachelor of Science
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