respiration and metabolism

• aerobic respiration (with oxygen)

  glucose + oxygen ---> water + carbon dioxide

  • exercise : heart and breathing rate increase to increase blood flow to supply more oxygen and glucose to enable muscles to contract
  • respiration provides energy for:
  • chemical reaction
  • warmth
  • movement
• anaerobic respiration (without oxygen)

  glucose ---> lactic acid

  occurs during intense exercise:

  oxygen debt

  lactic acid is broken back down into glucose by the liver using oxygen
• anaerobic respiration in plants

  glucose ---> ethanol + carbon dioxide
• Metabolism

  the sum of all chemical reactions in a cell/organism

  • glucose --> starch, glycogen and cellulose
  • respiration
  • breakdown o excess proteins