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How do the sensitivity of the muscles in the back Vary as the distance of the prong gets less.

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How do the sensitivity of the muscles in the back Vary as the distance of the prong gets less Plan: my experiment is to test how sensitive the muscles in the back can be and how well they can detect the number of prongs touching them from the hair pin which will decrease in size by 2mm each turn I will test each person one but with 10 sets of results from the tests which will be 10mm, 8mm, 6mm, 4mm and 2mm. I want to see if the size of the muscle contributes to the sensitivity of it. The muscles that I will be testing are: Trapezius muscle (fairly sensitive) Deltoid muscle (sensitive) Infrasprinatas muscle (sensitive) Latissimus dorsi muscle (not sensitive) Gluteus medias muscle (sensitive) Apparatus: I think that the larger the muscle the less sensitive it is likely to be this is because the nerve endings will be further apart so the muscles will not be able to detect the smaller distances of the prongs. ...read more.


Due to preliminary work I have found that the larger the muscle the less sensitive the muscle is. To make sure that all the results are valid I have to use the same amount of pressure on each test so that there is no discrepancy in the results therefore the subjects being tested will all be subdued to the same pressure therefore the result will totally rely on the sensitivity of the muscle. The pressure on the subjects will not be great so that the subject can feel pain but only just so that the subjects can detect the pressure of the hairpins. Results: muscle 10mm 8mm 6mm 4mm 2mm * * * * * * * * * * Trapezius muscle 72 28 66 34 52 48 36 64 31 69 Deltoid muscle 86 14 82 18 75 25 59 41 48 52 Infrasprinatas muscle 83 17 ...read more.


The results may also vary due to the size of the muscles of subject that is being tested and the positioning of the hairpins on the muscle as in certain places the hairpin would be touching more nerve endings than in other pars of the muscle and visa versa. If a was to improve the experiments I would test more people and if I had the facilities to use a lie detector I could find out whether the subject is being truthful and also I would want to use a very precise measurement with a proper tool that is fully adjustable to within a fraction of a millimetre so that the distance between the prongs does not change with the slightest movement and that if pressure is applied the prongs do not spread Daniel Williams Biology Coursework 1 ...read more.

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