<p> Body Temperature – Homeostasis</p><p>Aim: To observe the affects of heat or cold on the human body. </p><p>Materials: Dataloggers or manual equipment to record heart- rate, and body temperature</p><p>Method: Record what we did for each condition</p><p>Observations:</p><p>Time Hot condition Cold Condition (min) 0</p><p>2</p><p>4</p><p>6</p><p>8</p><p>10</p><p>12</p><p>14</p><p>16</p><p>18</p><p>20</p><p>Data Logging Information: Make a chart for each condition from the data supplied by your teacher. You can use Microsoft excel to do this. Discussion: 1. Explain the trends you see in the hot graph Temp: There was a slight increase at the start- possibly because the sensor was cold when placed onto the subject- and still warming up. OR the subjects body may have adjusted quickly- sending warm blood to the skin surface to release heat. Then the skin temperature levelled of at a relatively constant rate. Probably because the body can not send anymore hot blood to the surface than it is already doing.</p><p>Heart rate: There is an initial drop- this could be because the subject was nervous, also it could have been slowing down because he was stationary. Then there is an increase in rate- this could be to increase the rate of blood of blood flowing to the surface to release more heat. Another possibility is that there is a drop in blood pressure due to the extra blood flowing to the skin- so the heart pups faster to increase blood pressure. It is also possible that his heart rate naturally fluctuates and changes.</p><p>2. What is the body doing to stabilise the temperature?</p><p>Sweating – evaporates and cooles the skin Vasodilatation- sends more blood to skin- to release heat by radiation. Increase heart rate- from above</p><p>3. Explain the trends you see in the cold graph</p><p>Skin temp less than mouth because…. Skin is cooled by air, and is far away from the core. Gradual rise in both temperature- may be significant- possibly the body is increasing the rate of metabolism to heat the body up.</p><p>Heart rate: sharp increase then gradual increase… if metabolism has increased in the cells of the body- they require more energy and oxygen- so the heartrate increases to supply these needs. </p><p>4. What is the body doing to stabilise the temperature</p><p>Increase Metabolism… Vaso-conscritition – decrease blood to skin to slow cooling. Shivering- increase heat via friction of the muscles Goosebumps- decrease circulating air which will cool the skin.</p><p>Conclusion: How did we meet the aim? What could be done to improve this experiment?</p>