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
• How many chambers does the human heart have?

  Four chambers
• What are the names of the upper chambers of the heart?

  Left atrium and right atrium
• What are the names of the lower chambers of the heart?

  Left ventricle and right ventricle
• What separates the atria from the ventricles?

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

  It shows the view as if looking at a person
• What does the vena cava do?

  Brings oxygenated blood from the body
• What is the function of the pulmonary artery?

  Transports blood from the heart to the lungs
• What does the pulmonary vein do?

  Brings oxygenated blood to the heart
• What is the function of the aorta?

  Pumps blood from the heart to the body
• What happens when blood enters the atria?

  The atria contract and force blood into ventricles
• What prevents blood from flowing backwards into the atria?

  Valves in the heart
• Why is the left ventricle's wall thicker than the right ventricle's?

  It pumps blood around the entire body
• What do coronary arteries do?

  Supply oxygen to heart muscle cells
• 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 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, pushing blood out of the heart
  4. Valves prevent backflow into atria
• What are the key differences between single and double circulatory systems?

  • Single circulatory system:
  • Blood passes through the heart once
  • Slower blood flow, less oxygen delivery
  • Double circulatory system:
  • Blood passes through the heart twice
  • Faster blood flow, more oxygen delivery