The Heart

• PROCESS:

  1. Blood flows into right atrium by vena cava
  2. Blood goes into right ventricle through valves
  3. Blood leaves the ventricle through pulmonary artery to organs
  4. Blood returns to left ventricle by pulmonary vein
  5. Blood goes into left ventricle through valves
  6. Blood leaves ventricle through aorta
• • The heart is an organ that pumps blood around the boy in a double circulatory system
• • Resting heart rate is controlled by a group of cells in the right atrium walm that act as a pacemaker
  • The cells produce small electrical impulses which spreads to surrounding muscle cells, causing them to contract
• Artifical pacemaker:

  • Artifical pacemakers are electrical devices used to correct irregularities in the heart rate