ATP (Adenosine Triphosphate) & PC

ATP (Adenosine Triphosphate) & PC

1. Stored in the muscles and provides kinetic energy

   • this controls the muscle contraction

2. ATPase breaks the bond between the last two phosphates

   • Then releases the store of potential energy to carry out muscle contraction
     • This is then called an exothermic reaction
       • the reaction then leaves behind a compound adenosine diphosphate

3. Can be quickly broken down and stored exactly where it is needed in the muscles

   • only has enough ATP for 2-3 seconds of use
     • the body reproduces ATP by using ATP resynthesis, which means the ATP breaks down to ADP in reversible reaction
       • ATP is needed to rebuild the bonds between the two phosphates and the reveraible requires energy
         • This is then called and endothermic reaction.

4. The ATP & PC provides energy vie the coupled reactions

   • PC is another high energy phosphate compound which stores potential energy

5. When the ATP levels are low the ADP levels increase

   • This will intiatate creatine kinase, this breaks down the PC bond releasing the energy
     • This energy cannot be used for muscle work but is then coupled to resythesis of ADP back into ATP

6. The ATP/PC system can work aerobically, it does not need oxygen so is termed anaerobic and takes place in the sarcoplasm of muscle cells

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