Circulatory System - Heart

• Circulatory System


  The system that carries food and oxygen to every cell in the body, and also carries waste products to where they can be removed from the body
• The Heart


  The pumping organ that keeps the blood flowing around the body
• The circulatory system is made up of the heart, blood vessels and blood
• Double Circulatory System


  • The two circuits joined together: 1) Right ventricle pumps deoxygenated blood to the lungs, 2) Left ventricle pumps oxygenated blood around the body
• How the heart pumps blood

  1. Blood flows into the atria

  2. Atria contract, pushing blood into ventricles

  3. Ventricles contract, forcing blood into pulmonary artery and aorta
• The heart has valves to make sure blood flows in the right direction
• The heart has four chambers: right atrium, right ventricle, left atrium, left ventricle
• Arteries carry blood away from the heart, veins carry blood back to the heart
• The heart also needs its own supply of oxygenated blood from coronary arteries
• Pacemaker


  Group of cells in the right atrium wall that produce an electric impulse to control the resting heart rate
• Artificial pacemakers can be used to control an irregular heartbeat