CSB343H1 Lecture 6: Lecture 6

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Heat and temperature: heat (thermal energy) is an extensive quantity. It is energy with units j or cal (1 cal = 4. 186j: temperature is an intensive quantity. Reindeer thermoregulation: reindeer need to overcome seasonal changes in temperature by regulating their body temperatures, winter -40 to -50 degrees. Enzymes accelerate reactions by lowering the needed activation energy: enzymes lower the activation energy required for a reaction, a change in the temperature can effect whether the enzyme will be able to function properly. Hemoglobin: temperature can affect the oxygen binding to hemoglobin, hemoglobin is cool. Iron will bind to the oxygen: hard at the start to bind oxygen, conformational change that will allow another hydrogen to bind. Increase the partial pressure and you can increase the oxygen in the blood: sigmoidal curve, tops out around 60. In the lungs there is high oxygen and in the tissues, there is low oxygen.

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