respiration

• energy

  • energy in organisms is needed for chemical reactions to build larger molecules, movement and keeping warm
• aerobic respiration

  • aerobic respiration provides energy and requires oxygen
  • exothermic reaction (produces heat)
  • mitochondria
• anaerobic respiration

  • no oxygen needed and provides less energy thagt aerobic respiration as glucose not fully oxidised
  • occurs during intensive exercise
  • in cytoplasm
• lactic acid

  • produced in anaerobic respiration in muscles
  • build up of lactic acid causes fatigue
  • lactic acid must be taken to the liver by the blood so that it can be oxidised back to glucose
• oxygen debt

  • the amount of extra oxygen the body needs after exercise to react with the lactic acid and remove it