Intro

• Closed Circulatory System

  • Occurs in vertebrae and earthworms.
  • Blood is pumped from the heart into blood vessels which reach all blood tissue.
  • Blood vessels branch into capillaries which occur between cells for the exchange of gases and nutrients.
  • Blood flows back to the heart with valves ensuring blood flows in one direction.
• Human Circulatory System

  • Humans have a closed system, where blood is limited to blood vessels.
  • Humans have a double circulatory system(pulmonary & systemic)
• Pulmonary Circulatory system

  • Blood flows from heart, to lungs and back to the heart
  • Deoxygenated blood leaves the right ventricle from the pulmonary artery and flows to the heart.
  • Oxygenated blood leaves the lungs via the pulmonary vein, to the left atrium.
• Systemic Circulatory System

  • Blood flows from the heart to the rest of the body and back.
  • Oxygenated blood leaves the left ventricle, via the aorta and branches into smaller arteries -> arterioles -> capillaries between cells.
  • Capillaries join to form venules and then veins.
  • Deoxygenated blood flows through the superior/inferior vena cava to the right atrium.