circulatory system

• Circulatory system


  Transports oxygen and nutrients
• Circulatory system


  • Has a group of cells
  • Vena
  • Right atrium
  • Pulmonary artery (to lungs)
  • Aorta (to body)
  • Left atrium
  • Pulmonary vein (from lungs)
  • Valves - stop backflow of blood
  • Left ventricle
  • Right ventricle
  • Muscular walls
• Heartbeat


  Repeat 70x 2 minutes
• Pacemaker


  Sends small electrical impulses
• Artificial pacemaker


  Small device with wire that carries electrical current
• Artery


  Carries blood one way from the heart
• Vein


  Carries blood towards the heart
• Coronary arteries


  • Encircle the heart to make sure the muscle tissue gets all of the oxygen and nutrients
• Arteries


  • Carry blood away from heart
  • Blood will be at high pressures - need to be strong and elastic
• Capillaries


  • Exchange nutrients and oxygen with tissues
  • Take away waste products (CO2)
  • Single cell thick and permeable
• Veins


  • Carry blood towards the heart
  • Relatively large
  • Thin walls
  • Carry low pressure blood so walls don't have to be strong
  • Valves - prevent blood from flowing backwards
• Total cross sectional area (all capillaries) is greater than the aorta
• Low blood pressure