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  • 1. What is the circulatory system?  The circulatory system carries blood and dissolved substances to and from different places in the body.  The Heart has the job of pumping these things around the body.  The Heart pumps blood and substances around the body in tubes called blood vessels.  The Heart and blood vessels together make up the Circulatory System.
  • 2. Our circulatory system is a double circulatory system. This means it has two parts. Lungs the right side of the left side of the system the system deals with deals with oxygenated deoxygenated blood. blood. Body cells
  • 3. The Heart This is a vein. It brings blood from the body, except the lungs. These are arteries. They carry blood away from the heart. 2 atria 2 ventricles The heart has four chambers Coronary arteries, the hearts own blood supply
  • 4. The Heart Right Pulmonary Artery Superior Vena Cava Right Atrium Aorta Left Pulmonary Vein Left Atrium Tricuspid Valve Aortic Semilunar Valve Right Ventricle Left Ventricle
  • 5. How does the Heart work? STEP ONE blood from the body blood from the lungs The heart beat begins when the heart muscles relax and blood flows into the atria.
  • 6. How does the Heart work? STEP TWO The atria then contract and the valves open to allow blood into the ventricles.
  • 7. How does the Heart work? STEP THREE The valves close to stop blood flowing backwards. The ventricles contract forcing the blood to leave the heart. At the same time, the atria are relaxing and once again filling with blood. The cycle then repeats itself.
  • 8. Circulatory system responsible for circulating oxygen and nutrients to all parts of the body, unfortunately this systems also affected by age. The walls of the arteries thicken, lose their elasticity, and become stiffer. This causes a decrease in blood flow to vital organs and causes blood pressure to rise. An age-related increase occurs in blood pressure. As a result, the heart needs to work harder to pump blood into the systemic circulation.
  • 9. Thank you…