The heart

• Reart


  The heart
• Double circulatory system


  • Right ventricle pumps deoxygenated blood to the wings
  • Left ventricle pumps oxygenated blood around to other organs
• Heart rate


  Controlled by a pacemaker, cells that produce electrical impulses which spread causing muscles to contract
• Heart


  • Has valves to prevent backflow
  • Has 4 chambers (right atrium, left atrium, left ventricle and right ventricle)