compulsary essay

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compulsary essay
Biology coursework

Hypothesis: I predict that the longer you are contracting the peg the slower you will become when doing so, this is because of muscle fatigue. And when taking two seconds between each contraction the speed will decrease at a much slower rate than if you are doing the contractions as fast as you can.
The science backing up my hypothesis: The higher the intensity of any type of exercise the more lactic acid is produced in a certain amount of time, this is by a means of anaerobic respiration. Glucose+ Oxygen = Carbon Dioxide+ Water.
Equipment: plastic or wooden pegs. – Because the exercise isn’t too strenuous on the body and it is a reliable way to showcase the toll of muscle fatigue.
Stopwatch. – To record the time it takes for the muscle to become unable to continue contracting the peg and to time the two second breaks in test two.
Method:
Check timer, metronome and clothes peg are in working condition.
Set the metronome to your chosen rate starting from 150 bmp, 140 bpm, 130 bpm, 120 bpm and 110 bpm. Your partner should count yourself in and then when the timer is started you have to start contracting the peg to the beat of the metronome pressing the peg down fully.
When you cannot make both sides of the peg touch stop the timer as your attempt is over.
Then swap over and let your partner contract the peg while you time.
Enter results into a graph.

Control variables: I will use the same peg due to the spring stiffness, I will record all results in the same unit of time (sec) and I will use the same stopwatch that is calibrated for recording seconds and the person doing the experiment so the muscle is the same that is being tested.
How I will keep certain things the same: I will ensure I am in the same room when I do the experiment and will complete the experiment over one lesson. I will use the same peg throughout the whole experiment unless the peg is broken which means the whole experiment will have to be repeated.

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