Experiment B-9, Thermoregulation and Perspiration
Contents
1. 1 NeuLog EZ Experiment B 9 Thermoregulation and Perspiration 4 Aa N Objectives To learn about homeostasis and thermoregulation To learn about the importance of perspiration To understand the relationship between perspiration and relative humidity by using a relative humidity sensor Modules and Sensors PC NeuLog application USB 200 module NUL 207 Relative humidity logger sensor Materials Plastic bag Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5 2 NeuLog EJ Introduction Living organisms adapt to external environmental fluctuations in order to maintain a relatively steady internal environment The tendency of an organism or a cell to regulate its internal conditions is called homeostasis Homeostatic mechanisms regulate many different parameters pH dissolved oxygen glucose concentration etc Homeostatic control of an organism s body temperature is called thermoregulation Internal temperature changes affect enzyme function muscle activity metabolism and more physiological aspects The two primary responses to external temperature changes exhibited by animals are poikilothermy and homeothermy Poikilotherms regulate their body temperature by selecting an appropriate external environment Homeotherms also rely on physiological mechanisms in which they produce or dissipate heat As ambient temperature increases homeotherms cool down by the dilation of blood vessels When2. ain Keep your palm in the bag for the rest of the measurement Summary questions 1 Give an example of another homeostatic mechanism different than thermoregulation and explain how the body regulates its internal condition by using this mechanism An abnormal lack of sweat in response to heat is called anhidrosis Why is this condition harmful What can a person with this condition do in order to improve the situation Describe how the relative humidity changed throughout the second measurement the challenge experiment Explain your results Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5
3. ilar to the following NeuLog 6 Tra Tp The hand and the humidity sensor were inside a closed bag Relative humidity in the room before lacing the en ae the The hand was near sensor the humidity sensor Be ke Grid Graph Table Point Area R a IQ EI ls Time Minute Unzoom Zoom Zoom Select Line Show All Fit Zone Width Functions 16 We can see that after placing the hand near the relative humidity sensor the relative humidity slightly increased from 38 9 to 39 1 The sensor reacted to the vaporized sweat produced by the hand s sweat glands After tying the bag around the hand with the sensor inside the bag the relative humidity increased The bag blocked the air flow in and out of it therefore the vaporized sweat accumulated inside Challenge experiment 17 Change the experiment duration to 15 minutes This measurement is longer so you can observe the relative humidity changes over a larger period of time 18 Put the sensor inside the bag but keep the bag open as in the beginning of the first experiment Wait until the relative Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5 19 20 8 NeuLog EF humidity value is the same or close to the one measured in the beginning of the first experiment the baseline part Click on the Run Experiment icon J to start the measurement After one minute insert your hand into the bag and tie it ag
4. these vessels dilate warmed blood from the core of the body is carried to the skin and heat is lost to the environment Some homeotherms also use sweating and or panting in order to lose heat The evaporation of sweat perspiration has a cooling effect The energy required for evaporation is absorbed from the skin The sweat will sufficiently evaporate if the environmental air has a relatively low humidity Gas Absorbs heat fromthe surrounding Liguic Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5 3 NeuLog EJ Actually a small amount of perspiration is continuously excreted by sweat glands in the skin Frequently the sweat evaporates before it may be observed In this experiment the palm of your hand and a relative humidity sensor will be placed inside a plastic bag You will observe the changes of relative humidity throughout the measurement Procedure Experiment setup 1 Set up the experiment as shown in the picture below 2 Make sure you have a plastic bag that is big enough to contain the palm of your hand and also the sensor connected to the USB module The bag should not be too big it would increase the necessary measurement time 9 It is preferred to keep the air conditioner off during the measurement 4 Place the relative humidity sensor connected to the USB module in the plastic bag Keep the bag open and flat Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5 4 Ne
5. uLog EF sensor setup 5 Connect the USB 200 module va to the PC 6 Check that the relative humidity sensor is connected to the USB 200 module Note The following application functions are explained in short It is recommended to practice the NeuLog application functions as described in the user manual beforehand 7 Run the NeuLog application and check that the relative humidity sensor is identified settings 8 Click on the On line Experiment icon to in the NeuLog main icon bar 9 Use the Experiment Setup icon Ey and set the Experiment duration to 10 minutes Sampling rate to 60 per minute Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5 5 NeuLog EF Testing and measurements 10 11 We want to measure the relative humidity in the room and establish a baseline Click on the Run Experiment icon D to start the measurement After two minutes place your hand close to the relative humidity sensor without closing the bag Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5 6 NeuLog EJ 12 Six minutes after the beginning of the measurement four minutes after placing the hand near the sensor ask another student to tie the bag around your hand 13 Follow the relative humidity changes until the end of the measurement Experiment B 9 Human Body Temperature Heat Loss Ver 3 2 5 7 NeuLog EJ 14 Click on the Zoom fit icon be 15 Your graph should be sim
Download Pdf Manuals
Related Search