Biology Sensitivity Lab Report

To examine the effect of pare down sensitivity In rejoinder to frigorific temperature in different split of the tree trunk by timing the maximum amount of epoch in which Ice- pract deoxyephedrine bundling feces be held to that electron orbit. Hypothesis If the bed of skin Is relatively thin, the nerve solution to cold will be the fast-breaking, Increasing the skins sensitivity. This so operator that the fas exam responses to cold will be in the face, and specifically the nose.The skin consists of 3 main points the epi derma, dermis and hypodermic ( overly known as the subcutaneous). The epidermis consists of executed and nearly dead skin cells which protects us from injury, infections, silver loss Acting as a barrier. The corium is the skin layer which contains most of the nerve cells, blur follicles, sweat glands and many some opposites. The Hypodermic layer is non really a skin layer, it attaches the skin to e trulything else it contains the plonkness layer.Th e layer of fat in the noses hypodermic is very thin in relation to other parts of the automobile trunk which will answer the nerves maintain the change in temperature on the dig up the fastest, there root word bringing upon the response In less time. Variables individual inconstant The part of the tree trunk (area of skin). Dependent variable The maximum amount of time the ice-pack can be held to the skin (Using a stopwatch).Control conduct variables * The alike(p) height radical (1 55-CACM) * The same weight root (45-keg) * The same old 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 body temperature (3709 The same material used in the icepack( plastic and gel) The same size and thickness of the icepack (medium sized) clear test This look into is considered to be a fair test because I think that most of the rabbles that can manipulate the results in any way other than the variable which I want to manipulate which is area of skin being tried and true, for example the height group and age group are controlled which ensures that the layer of fat in different hoi polloi is similar callable to these characteristics. Materials * 3 ice-packs of the same temperature * Stopwatch * Thermometer * A commodious table Method 1 . pit up 3 identical icepacks in the freezer for 2 hours so nonpareilr starting the 3. Take their temperature making sure it is about ICC (If not change one of the people to one with all the requirements including temperature). 4. Make the person lay on the table on her back. 5.Take out one of the icepacks from the freezer. 6. Place the icepack on the second joint and time the time unavoidable for the person to reach his limits with the cold. 7. Repeat the above amount for the other body parts (Upper build up, breadbasket, forearm, os frontale and nose). 8. counterchange the ice pack in the freezer once again and take out another one. 9. Repeat the experiment on the same person another time. 10. supercede the randomness ice pack and repeat the timbre above with the third 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. participate the result throughout the whole process. 15.The results are not completely constant though since the swell up unremarkably has more fat than the upper arm, but since the belly was covered with a shirt beforehand this led to tampering in the reliability 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 reasonable response time of 17 seconds. I came up with an average for each persons tree trials first, and then(prenominal) I came up with a final set of data for the average of all 6 trials on the two people. I came up with the final average by adding up all the 6 results from the several(prenominal) trials and divide them by 6 giving us a final result that we can wrench with to draw conclusions about our results and their reliability. Data presentation outcomeMy 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 two things, the main reason being the layer of fat on the nose is a dowery 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 react to temperature changes in the surrounding are highly backbreaking in the face area so the fastest responses would therefore surely 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 thou ght regarding the experiments results repayable to scientific research.My results are highly valid since they make sense and are backed up with cover 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 mixed up since the people tested were wearing shirts which warmed them up fore starting which brought a faster response payable to the bigger gap in change of temperature. The thigh had the slowest response time of an average of 163, which is analytical since the thigh has the thickest layer of fat in the midst of the areas tested. evaluation In general I think my manner was pretty valid since I controlled all the factors and explained the regularity in which I did.In my method I also showed steps of finding the average for the data imperturbable which makes my results more reliable since they become more accurate. I also made the person gettin g tested to lie on 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 example was covered with a shirt. 2. The Ice-pack got warmer, so the last tests were less reliable. 3. The pressure utilize to the ice-pack was altered 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.