Energy Metabolism Flashcards
What does any chemical reaction produce or consume?
A certain amount of heat (which can be determined experimentally)
For biological reactions what is relevant to know (energy)
How much usable energy a reaction can yield
What term is used to characterize biological reactions?
Free energy
What does free energy include?
The heat generated during the reaction and the change in entropy “order” of the systems
Delta G = Delta H- (T x Delta S)
What is constant in biological systems?
Temperature
What happens if free energy is negative?
The reaction can provide usable energy and the reaction will proceed towards the products
What happens if the free energy is positive?
The reaction will proceeds towards the substrated spontaneously but will require energy input to proceed towards the products
What is the most important biological variable that changes the free energy of a reaction?
The concentration of substrates and products
What energy does full oxidation of glucose yield?
A large amount (2800 kJ/mol)
How much heat does instant oxidation (burning) generate?
An equivalent amount of heat
The body wants to store and convert this energy into …
Movement, ion gradients, biosynthesis of valuable building blocks, etc.
How can energy generated in any metabolic reaction be measured?
Experimentally and their values can be found in Biochemistry textbooks
What is the equation to illustrate the energy demand of your body?
Basic metabolic rate (kj) = Body weight (kg) x 100
To the equation for the energy demand of your body, what percentage is added to the value for a sedentary person ?
30%
To the equation for the energy demand of your body, what percentage is added to the value for a person with 2 hours of moderate exercise?
60-70%
