role of ATP

• what is ATP

  • adenosine triphosphate ( made up from adenosine and 3 phosphate molecules )
  • when energy needed stored ATP splits
  • its a High energy compound
  • ATP is the only form of energy we can use for muscular contractions
  • ATP is stored in muscle
• breakdown of ATP

  • the enzyme ATPase is released to stimulate the breakdown of the high energy bond
  • ADENOSINE DIPHOSPHATE + SINGLE PHOSPHATE + ENERGY
  • An exothermic reaction takes place which releases energy needed for muscular contraction
• why does ATP need to be resynthesised

  • although ATP is stored in muscle, stores exhausted quicklywe only have enough ATP stored in body to last 2 secondsto continue muscular contractions we must resynthesises ATP quickly
• how do we resynthesises ATP

  • resynthesising ATP requires an endothermic reaction ( absorbs energy)
  • energy is needed to rebuild the high energy bond between ADP and the single phosphate
  • food that we eat can be stored as amino acids, triglycerides and glycogen
  • when these fuels are metabolised the energy from them is used to resynthesises ATP
  • aim is to get ADP + Pi + ENERGY = ATP
• name 3 energy systems that provide energy for ATP resynthesises

  • anaerobic ATP-PC system
  • anaerobic glycolytic system
  • aerobic system