Lab Paper unit 3 Muscles
For this lab project we were asked to experiment with our muscles. What happens when a muscle is relaxed and what about when it is flexed? What would happen after repeated use and what about after cold exposure? For these experiments we were asked to measure our bicep relaxed and then flexed. We were asked to repeatedly open and close our hand, making a fist. The final experiment was to hold your hand in ice water for a minute and then count how many times you could make a fist in 20 seconds. Then we had to take a look at the results and compare them with the before results.
For this experiment I was able to make a fist ten less times after my muscles were exposed to ice water. My hand ached because of the cold and when I pulled it out of the bowl my muscles were contracted or curled. They didn’t want to open up easily.
Figure 1: Effect of Temperature on Muscle Action
Temperature
Number of Fists
Normal 37
Ice Water 27
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For this experiment I had to hold a ball in the palm of my hand and make a fist as many times as I could in 20 seconds. The only problem is that you muscles get tired from repetitive use, so after a while you can do fewer and fewer fists.
Figure 2: Effect of Fatigue on muscle action
Trial
# of Squeezes in 20 seconds
9 More X's
1 37
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2 35
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3 33
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4 31
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5 31
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6 31
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7 28
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8 30
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9 30
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10 28
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Please excuse the spacing on this chart; I couldn’t get it to let me write in the further over boxes.
ANALYSIS OF DATA:
What are the three changes you observed in a muscle while it is working (contracted)?
The muscles became larger around but shorter in length. They are hard when contracted. After time muscles get tired and can’t perform as quickly as before.
What effect did the cold temperature have on the action of your hand muscles? Explain.
The cold made my fingers curl. It hurt after a while in the ice. My fingers didn’t want to open and close as quickly.
Question 4: What effect did fatigue have on the action of your hand muscles? Explain.
After a while of use it is harder and harder to keep up the same rate of speed as when you first started. The muscle gets tired of repetitive use.
For Conclusion I believe that during cold the muscles contract to help maintain body temperature. This is done by breaking down ATP which in turn releases heat. So after exposing my hand to freezing water the muscles were contracting to generate heat. Once I removed my hand my fingers were still contracted due to the cold. This made it harder to open and close them. Muscles fatigue because the have depleted their energy reserves. A muscle contracts when calcium leaves the sarcoplasmic reticulum and it relaxes when calcium returns. So if you rapidly make a fist over and over the muscle doesn’t have a chance to relax. This causes it to get fatigued and not work as well. So these experiments were good examples of muscle fatigue and temperature retraction.
For this lab project we were asked to experiment with our muscles. What happens when a muscle is relaxed and what about when it is flexed? What would happen after repeated use and what about after cold exposure? For these experiments we were asked to measure our bicep relaxed and then flexed. We were asked to repeatedly open and close our hand, making a fist. The final experiment was to hold your hand in ice water for a minute and then count how many times you could make a fist in 20 seconds. Then we had to take a look at the results and compare them with the before results.
For this experiment I was able to make a fist ten less times after my muscles were exposed to ice water. My hand ached because of the cold and when I pulled it out of the bowl my muscles were contracted or curled. They didn’t want to open up easily.
Figure 1: Effect of Temperature on Muscle Action
Temperature
Number of Fists
Normal 37
Ice Water 27
------------------------
For this experiment I had to hold a ball in the palm of my hand and make a fist as many times as I could in 20 seconds. The only problem is that you muscles get tired from repetitive use, so after a while you can do fewer and fewer fists.
Figure 2: Effect of Fatigue on muscle action
Trial
# of Squeezes in 20 seconds
9 More X's
1 37
----------------------------------------
2 35
----------------------------------------
----------------------------------------
3 33
----------------------------------------
----------------------------------------
4 31
----------------------------------------
----------------------------------------
5 31
----------------------------------------
----------------------------------------
6 31
----------------------------------------
----------------------------------------
7 28
----------------------------------------
----------------------------------------
8 30
----------------------------------------
----------------------------------------
9 30
----------------------------------------
----------------------------------------
10 28
----------------------------------------
----------------------------------------
Please excuse the spacing on this chart; I couldn’t get it to let me write in the further over boxes.
ANALYSIS OF DATA:
What are the three changes you observed in a muscle while it is working (contracted)?
The muscles became larger around but shorter in length. They are hard when contracted. After time muscles get tired and can’t perform as quickly as before.
What effect did the cold temperature have on the action of your hand muscles? Explain.
The cold made my fingers curl. It hurt after a while in the ice. My fingers didn’t want to open and close as quickly.
Question 4: What effect did fatigue have on the action of your hand muscles? Explain.
After a while of use it is harder and harder to keep up the same rate of speed as when you first started. The muscle gets tired of repetitive use.
For Conclusion I believe that during cold the muscles contract to help maintain body temperature. This is done by breaking down ATP which in turn releases heat. So after exposing my hand to freezing water the muscles were contracting to generate heat. Once I removed my hand my fingers were still contracted due to the cold. This made it harder to open and close them. Muscles fatigue because the have depleted their energy reserves. A muscle contracts when calcium leaves the sarcoplasmic reticulum and it relaxes when calcium returns. So if you rapidly make a fist over and over the muscle doesn’t have a chance to relax. This causes it to get fatigued and not work as well. So these experiments were good examples of muscle fatigue and temperature retraction.
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