Circulatory System

• Circulatory System

  • Responsible for moving blood around the body
  • The blood transports many substances including nutrients and waste around the body.
• The Heart

  • Large two-part pump
  • Four Chambers
  • 2 atria at the top
  • 2 ventricles at the bottoms
  • Right side of the heart pumps blood to the lungs to be oxygenated.
  • Oxygenated blood moves back to the left atrium and onto the left ventricle.
  • The left ventricle pumps blood out through the aorta at the top of the heart and around the body.
  • Valves keep the blood moving in the right direction until it gets back the right atrium of the heart.
• Blood

  • Blood is combination of cells, cell fragments, liquid and dissolved substances.
  • Oxygen is carried by red blood cells from the lungs to all the cells of the body.
  • Carbon Dioxide, nutrients and wastes are dissolved in the plasma for transport to and from cell.
  • White blood cells are part of the immune system. They travel to places where pathogens may have entered the body to fight and kill infection.
  • Platelets are cell fragments that burst when exposed to breaks in the blood vessels they fill the hole and glue the edges together.
• Blood vessels

  • Blood travels through blood vessels
  • Arteries are the largest blood vessels

  They are thick muscular walls blood flows under high pressure. They carry blood away from the heart. Arteries branch into arterioles(small arteries) and connect to them are the capillaries.
• Capillaries are thin walled blood vessels that allow substances to pass in and out of blood. Capillaries are the vessels that arteries and veins.
• Veins contain one way valves which enable them to carry blood back to the heart, for it to be pumped somewhere else.