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How respiration varies and alters during exercise

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Introduction In this investigation I intend to show how respiration varies and alters during exercise, I will attempt a prediction of what I think will happen at the end of the tests based upon my scientific knowledge. I will also include how the test will be carried out, concerning fair testing, and I will show and evaluate my results in a result table and graphs. Our bodies need energy to keep us alive. We release energy from our food by a process called respiration. Respiration happens in every cell of the body and is very important to both plants and animals to keep us alive. The food we use for respiration is usually glucose but other kinds of food can be used if enough glucose is not available. Respiration usually involves oxygen, this kind of respiration is called aerobic respiration and it provides most of the energy we need. The waste products in aerobic respiration are the carbon dioxide and water, both of which are summarised in the word equation below: Glucose + Oxygen � Water + Carbon Dioxide + Energy Although most of the energy produced is lost as heat, the rest that is released is used for all of the life processes a living creature has. If more energy is needed that cannot be produced by aerobic respiration then anaerobic respiration takes place. ...read more.


I will count how many pulls I do as I go and when the time reaches 20 seconds I will state the amount of pulls I did and my partner will note them. This process will continue for 120 seconds until six sets of data are produced. Then the 2mm band will be replaced with a thicker band and the process will be repeated. There will be five different thickness' of bands and each thickness will be tested twice in order to produce a more accurate average for my results. Below is a diagram of the equipment I will make use of and the way it will be set out: These tests will be suitable for my investigation because they link in with respiration and the results will (hopefully) show how respiration affects exercise and the difference between aerobic and anaerobic respiration. Prediction In my investigation I predict that as the time passes I will begin to do less and less finger pulls. I also predict that I will do less pulls overall as the bands get thicker. I believe this because of my knowledge of respiration and its effects on the body. I think that when my finger begins to tire (muscle fatigue) it is actually the anaerobic respiration product lactic acid that tires it. ...read more.


As you may have noticed there are several intervals where a big difference in the amount of finger pulls done incurred. An example is the 20 - 40 seconds of average data for the 8mm band. There you see quite a large drop of 7 pulls per 20 seconds. That drop could indicate the switch between aerobic and anaerobic respiration, because the anaerobic will produce less energy causing a muscle fatigue. The lactic acid that builds up also would have slowed down my finger pulls. Evaluation I found quite a few difficult parts to this investigation. A major problem was trying to count the pulls and state how many you had counted at the same time every 20 seconds. Sometimes I lost count and had to guess which may have varied me a few pulls and this may have made my results less reliable to go by. Another smaller problem was trying not to go too fast on each band and trying to start on the same pace as the other tests, this may have also affected my results. In the future I would try to improve my result accuracy by combating the problems explained above. An option could be to use a better apparatus that would count the finger pulls for me and keep count. I may have also concentrated more on the pace of the pulls to ensure a fair and accurate set of results to finish with. ?? ?? ?? ?? Biology Coursework: Muscles and Respiration ...read more.

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