the circulatory system

• Components of blood


  • Plasma - dissolves and carries substances around the body
  • Platelets - lots the blood
  • Red blood cells - carries oxygen around the body
  • White blood cells - creates antibodies to fight pathogens
• Veins


  Carries deoxygenated blood to heart. Thin wall and wider lumen
• Arteries


  Away from the heart. Thick muscular wall and narrow lumen
• Capillaries


  One cell thick
• The heart


  • Vena cava - carries deoxygenated blood from the body to the right atrium
  • Right atrium - receives deoxygenated blood from the vena cava
  • Right ventricle - receives deoxygenated blood from the right atrium to the pulmonary artery
  • Pulmonary artery - receives deoxygenated blood from the right ventricle to the lungs
  • Pulmonary vein - carries oxygenated blood from lungs to left atrium
  • Left atrium - carries oxygenated blood from the pulmonary artery to the left ventricle
  • Left ventricle - carries oxygenated blood from the left atrium to the aorta
  • Aorta - carries oxygenated blood from the left ventricle to the body
• Cardiac output


  Heart rate x stroke volume
• Cardiac output


  The amount of blood expelled from the heart each minute
• Stroke volume


  The volume of blood pumped out of the heart by each ventricle in one beat
• Heart rate


  Measures the beat per minute