anaerobic ATP-PC system

• describe the PC

  • phosphorocreatine is stored in muscle
  • PC is one creatine molecule and one phosphate
  • after first few seconds of explosive activity, ATP levels fall which triggers the release of the enzyme creatine kinase
• what type of reaction is used in atp-pc system

  • coupled reaction
  • exothermic = energy released from PC breakdown
  • endothermic = energy absorbed to be able to resynthesises ATP
• disadvantages of the ATP-PC system

  • limited supply of PC in muscles = only provide energy up to 10 seconds after that fatigue occurs
  • Only one molecule of ATP produced from one molecule of PC so not efficient
  • PC regeneration only take place in presence of oxygen so very high intensities can't be maintained after 10sec
  • PC resynthesis takes 2 - 3 minutes so rest is required for full resynthesis
• describe creatine kinase

  • creatine kinase is an enzyme used to breakdown PCthe bond between creatine and phosphate is broken , releasing energy for ATP resynthesis
• where does it take place and how long does energy from this system last

  • sarcoplasm
  • energy from this system last for up to 10 seconds
• what type of activities would use ATP-PC SYSTEM

  • all explosive under 10 sec
  • rugby tackle
  • long jump
  • shotputt
  • 100m sprint
• advantages of atp-pc

  • few chemical reactions = immediate release of energy as ATP resynthesised quickly
  • anaerobic system not reliant on 02 = no delay
  • creatine supplements taken to extend time of atp-pc system
  • PC a simple compound = resynthesised quickly during breaks
  • no fatiguing byproducts = maximal contractions maintained