The circulatory system

• What is the main function of the circulatory system in humans?

  To transport substances around the body
• What are the main components of the circulatory system?

  Heart, blood vessels, and blood
• What does a double circulatory system mean?

  Two circuits joined together for blood flow
• What type of blood does the heart pump to the lungs?

  Deoxygenated blood
• What happens to deoxygenated blood in the lungs?

  It picks up oxygen
• What type of blood returns to the heart after the lungs?

  Oxygenated blood
• What is the role of the second circuit in the circulatory system?

  To deliver oxygen to body cells
• What is the significance of having a double circulatory system for mammals?

  More oxygen can be delivered to cells
• Why do mammals need a lot of oxygen?

  To keep their body temperature steady
• What type of muscle makes up the heart?

  Cardiac muscle
• How many chambers does the heart have?

  Four chambers
• What happens when the heart chambers contract?

  They squeeze blood through the heart
• Describe the flow of blood through the heart's right side.

  • Right atrium receives deoxygenated blood from the body via vena cava.
  • Blood moves to the right ventricle.
  • Right ventricle pumps blood to the lungs through the pulmonary artery.
• Describe the flow of blood through the heart's left side.

  • Left atrium receives oxygenated blood from the lungs via pulmonary vein.
  • Blood moves to the left ventricle.
  • Left ventricle pumps blood out through the aorta to the body.
• What is the function of the heart valves?

  To ensure blood flows in the right direction
• What happens when the ventricles contract?

  Tricuspid and bicuspid valves close, semi-lunar valves open
• What prevents blood from flowing backwards in the heart?

  Heart valves
• Which chamber of the heart pumps deoxygenated blood to the lungs?

  Right ventricle
• What are the names of the blood vessels attached to the heart?

  • Vena cava
  • Pulmonary vein
  • Pulmonary artery
  • Aorta
• What is the question asked in Q1 regarding the heart?

  Which chamber pumps deoxygenated blood?