metabolic rate 3

• Metabolic rate

  The amount of energy an organism will use within a given time
• Measuring and comparing metabolic rates

  1. Oxygen consumption using respirometers and oxygen probes

  2. Carbon dioxide production measured using respirometers and carbon dioxide probes

  3. Heat production – Using calorimeters
• Organisms with high metabolic rates

  Require a more efficient delivery of oxygen to cells
• Organisms ranked by metabolic rate

  • Birds and mammals
  • Reptiles and amphibians
  • Fish
• Fish circulatory system

  • Single circulatory system consisting of one atrium and one ventricle
• Amphibians and most reptiles circulatory system

  • Incomplete double circulatory system consisting of two atria and one ventricle
• Birds and mammals circulatory system

  • Complete double circulatory system consisting of two atria and two ventricles
• Complete double circulatory systems

  • Enable higher metabolic rates to be maintained
  • There is no mixing of oxygenated and deoxygenated blood
  • Oxygenated blood can be pumped out at a higher pressure
  • This enables more efficient oxygen delivery to the cell