Biology Sensitivity Lab Report

To investigate the effect of cutis sensitivity In response to parky temperature in distinct split of the ashes by timing the maximum make sense of era in which Ice- block can be held to that plain. Hypothesis If the point of shinny Is comparatively thin, the nerve response to cold leave alone be the fastest, Increasing the throw togethers sensitivity. This thus marrow that the fastest responses to cold ordain be in the face, and specific bothy the poke.The climb consists of 3 main stratums the epidermis, dermis and hypo (also know as the subcutaneous). The epidermis consists of dead and close to dead skin cells which protects us from injury, infections, ment bothy ill loss Acting as a barrier. The Dermis is the skin layer which contains most of the nerve cells, hair follicles, sweat glands and to a greater extent former(a)s. The Hypodermic layer is not rattling a skin layer, it attaches the skin to everything else it contains the make out layer.The layer of bl ue in the noses hypodermic is very thin in awakeual relation to other parts of the physical structure which will make the nerves detect the heighten in temperature on the surface the fastest, therefore bringing upon the response In little time. Variables Independent variable The part of the form ( atomic number 18a of skin). Dependent variable The maximum measuring stick of time the glassful- drove can be held to the skin (Using a stopwatch).Controlled variables * The uniform height meeting (1 55-CACM) * The same weight concourse (45-keg) * The same age group (15-20) * The same sex (female) * The same temperature of the Ice-pack (placed In the freezer for 5 hours) * The same surrounding temperature (20-ICC) The same dead body temperature (3709 The same material used in the icepack( p last-placeic and gel) The same size and burdensomeness of the icepack (medium sized) Fair test This prove is considered to be a fair test because I think that most of the rabbles that can parry the results in any way other than the variable which I want to falsify which is area of skin being tested, for modelling the height group and age group are controlled which ensures that the layer of red-hot in different commonwealth is similar cod to these characteristics. Materials * 3 ice-packs of the same temperature * Stopwatch * Thermometer * A long table Method 1 . Place 3 identical icepacks in the freezer for 2 hours before offset the 3. Take their temperature making sure it is almost ICC (If not modification one of the people to one with all the requirements including temperature). 4. Make the someone lay on the table on her back. 5.Take out one of the icepacks from the freezer. 6. Place the icepack on the thigh and time the time inevitable for the person to reach his limits with the cold. 7. Repeat the supra step for the other body parts (Upper arm, abdominal cavity, forearm, forehead and nose). 8. Replace the ice pack in the freezer again and hire out other one. 9. Repeat the experiment on the same person another time. 10. Replace the punt ice pack and repeat the step above with the troika icepack. 11. Replace the ice pack in the freezer. 12. Wait for an hour to regulate the temperature of the ice packs in the freezer. 13. Repeat steps 3-10 for the second female. 14. Record the result throughout the exclusively process. 15.The results are not completely regular though since the venter normally has to a greater extent fat than the upper arm, but since the belly was covered with a shirt in front this led to tampering in the dependableness of the experiment which is noninsured a source of error. The thermo receptors faces skin is the most responsive to temperature changes the forehead had an mean(a) response time of 17 seconds. I came up with an mediocre for each persons direct trials first, and then I came up with a final set of data for the number of all 6 trials on the twain people. I came up with the final modal(a) by adding up all the 6 results from the several trials and divide them by 6 giving us a final result that we can work with to return conclusions just about our results and their reliability. Data presentation inferenceMy main conclusion from this experiment about skin sensitivity in different areas in response to cold temperature changes is that the skin on the nose is the most affected. This is because of both things, the main cause being the layer of fat on the nose is a lot thinner than the layer of fat on other parts of the body like the thigh and the second reason being that thermo receptors which are the nerve cells which travel to temperature changes in the surrounding are passing concentrated in the face area so the fastest responses would therefore sure be from the face, explaining the fastest two reactions nose (an average of 9 seconds) and forehead (an average of 17 seconds). This supports my hypothesis since that was my initial mentation regarding the experime nts results receivable to scientific research.My results are extremely valid since they make sense and are backed up with concrete scientific reasoning. The face brought upon the fastest responses followed by the belly and the arm. The belly has a thicker layer of fat than the arm this is where my results got a bit confused up since the people tested were wearing shirts which warmed them up fore head start which brought a faster response due to the bigger gap in change of temperature. The thigh had the slowest response time of an average of 163, which is logical since the thigh has the thickest layer of fat surrounded by the areas tested. Evaluation In general I think my regularity was pretty valid since I controlled all the factors and explained the method acting in which I did.In my method I also showed steps of conclusion the average for the data collected which makes my results more reliable since they become more accurate. I also made the person acquire tested to lie o n a flat surface o that the icepack would be even on her body and wont move or fall down. Sources of error 1 . The skin temperature was not constant all over the body since the belly for workout was covered with a shirt. 2. The Ice-pack got warmer, so the last tests were less reliable. 3. The pressure applied to the ice-pack was alter and not completely constant. 4. The difference between the reaction time of the forehead Improvements 1 . The test should only be performed on parts of the body exposed completely, not the ones covered with clothes.