Online lab how do muscles work

Effect of Temperature on Muscle Action

1. Count the number of times you can make a fist in 20 seconds. Start with
your hand completely outstretched and make a tight fist each time. Do it
as rapidly as you can. Record the count in Figure 1. 47

2. Now submerge your hand in a dishpan of water to which has been added
snow or ice so that the temperature is near the freezing point. Leave your
hand in the water for one full minute.

3. Remove your hand and immediately count how many forceful fists you can
make in 20 seconds. Record in Figure 1. 15

Figure 1: Effect of Temperature on Muscle Action

Temperature
Number of Fists
Normal 47---------------
Ice Water 15
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Effect of Fatigue on Muscle Action

1. Count how many times you can tightly squeeze a rubber ball in your hand
in 20 seconds. Record in Figure 2. 43

2. Repeat the squeezing nine more times and record results. Do not rest
between trials.

(An alternative procedure which works well is to open and close a
clothespin with the thumb and index finger while the other fingers are held
out straight.)

Figure 2: Effect of Fatigue on muscle action

Trial
# of Squeezes in 20 seconds
9 More X's
1 43
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2 41
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3 36
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4 34
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5 29
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6 24
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7 17
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8 14
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9 13
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10 8
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ANALYSIS OF DATA:

1. What are the three changes you observed in a muscle while it is working (contracted)? enlarged, tightened, and became fatigued

2. What effect did the cold temperature have on the action of your hand muscles? Explain. It made my hand ache and feel really tense my muscle seemed tight
3. What effect did fatigue have on the action of your hand muscles?
My hand started aching and cramping like it couldn't do anymore. It seemed like my muscles were under stress I think this might be due to lack of oxygen and slowing down the process of producing ATP energy for my muscles.