amphibians

• heart structure


  3 chambers, 1 ventricle, 2 atrium

  
• seperation of blood

  • some mixing of oxygenated and deoxygenated blood
  • blood from lungs - left atrium
  • blood from body - right atrium
• delivery rate


  medium, ventricles generate pressure to force blood to lungs and body
• efficiency

  • medium
  • not all blood going to tissues is oxygenated to mixing
  • rely on O2 absorption through the skin to increase O2 concentration
  • medium activity levels
  • usually small in siz