The Heart and Circulation

• What should you be able to describe by the end of the video?

  The structure of the heart
• What type of circulatory system do fish have?

  Single circulatory system
• Where does deoxygenated blood go in fish?

  To the gills for oxygenation
• What happens to blood after it collects oxygen in fish?

  It passes to the organs
• What is a disadvantage of a single circulatory system?

  Blood loses pressure before reaching organs
• What type of circulatory system do humans have?

  Double circulatory system
• Where does deoxygenated blood go in humans?

  To the lungs for oxygenation
• What is the benefit of a double circulatory system?

  Blood can travel rapidly to body cells
• What are the four chambers of the human heart?

  • Left atrium
  • Right atrium
  • Left ventricle
  • Right ventricle
• What separates the atria from the ventricles in the heart?

  Valves
• Why does the heart appear back to front in diagrams?

  It shows the view as if looking at a person
• What blood vessel brings oxygenated blood from the body to the heart?

  Vena cava
• What blood vessel carries blood from the heart to the lungs?

  Pulmonary artery
• What blood vessel carries oxygenated blood from the lungs to the heart?

  Pulmonary vein
• What blood vessel pumps blood from the heart to the body?

  Aorta
• What is the pattern of blood flow through the heart?

  1. Blood enters left and right atria
  2. Atria contract, forcing blood into ventricles
  3. Ventricles contract, pumping blood out
  4. Valves prevent backflow into atria
• Why does the left side of the heart have a thicker muscular wall?

  It pumps blood around the entire body
• What do coronary arteries supply to the heart muscle?

  Oxygen
• What is the purpose of oxygen in heart muscle cells?

  Used in respiration for energy
• What controls the natural resting heart rate?

  A group of cells in the right atrium
• What is an artificial pacemaker?

  A device that corrects heart rate irregularities
• Where can you find questions on the structure of the heart?

  In the vision workbook
• What are the main functions of the heart?

  • Pump blood around the body
  • Supply oxygen to body cells
  • Remove carbon dioxide from the body
• What is the main tissue type that makes up the heart?

  Muscle tissue