23B Temp Cold Blooded (CO2)

23B Temp Cold Blooded (CO2) - Experiment Effect of...

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Biology with Calculators 23B - 1 Experiment 23B Effect of Temperature on Cold-Blooded Organisms In cold-blooded organisms, poikilotherms , there is a link between the temperature of the environment and the organism’s metabolic rate. Reptiles are a common example of a cold- blooded organism with which most people are familiar. If you have ever seen a lizard or snake in the early morning when the air and ground are cool, you may have noticed how slowly they move. They move slow when the environment is cold because they require heat from their surroundings to increase their internal temperature and metabolism. Once their internal body temperature has warmed, they can metabolize foods more quickly and produce the energy they need. Oxidative respiration is the process of metabolism where sugars are broken down. Under aerobic conditions, respiration yields chemical energy, carbon dioxide, and water. C 6 H 12 O 6 + 6 O 2  → 6 CO 2 + 6 H 2 O + energy glucose oxygen carbon water dioxide Crickets will be used to study the effect of temperature on the metabolism of cold-blooded organisms. You will determine how temperature affects the respiration rate of crickets by monitoring carbon dioxide production with a CO 2 Gas Sensor. 1. C O G a s S e n s o r 2 Figure 1 MATERIALS LabPro or CBL 2 interface 250-mL respiration chamber TI Graphing Calculator 600-mL beaker DataMate program 1-L beaker Vernier CO 2 Gas Sensor thermometer crickets or mealworms two 400-mL beakers balance basting bulb Graphical Analysis (optional)
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23B - 2 Biology with Calculators Experiment 23B PROCEDURE 1. Plug the CO 2 Gas Sensor into Channel 1 of the LabPro or CBL 2 interface. Use the link cable to connect the TI Graphing Calculator to the interface. Firmly press in the cable ends. 2. Turn on the calculator and start the DATAMATE program. Press CLEAR to reset the program. 3. Set up the calculator and interface for a CO 2 Gas Sensor. a. If the calculator displays CO2 GAS (PPM) in CH 1 , proceed directly to Step 4. If it does not, continue with this step to set up your sensor manually. b. Select SETUP from the main screen.
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