The Heart

• What are the four chambers of the heart?

  The left atrium,left ventricle,right atrium and right ventricle.
• What does the left atrium do?

  It collects oxygenated blood from the lungs (through the pulmonary vein) and pumps into the left ventricle.
• What does the left ventricle do?

  It pumps oxygenated blood to the body (via the aorta).
• What does the right atrium do?

  It collects deoxygenated blood from the body (through the vena cava) and pumps it into the right ventricle.
• What does the right ventricle do?

  It pumps deoxygenated blood to the lungs (via the pulmonary artery.)
• Why does the left ventricle have a thicker wall than the right ventricle?

  The left ventricle has a much thicker wall than the right ventricle because it needs more muscles since it needs to pump harder around the whole body while the right ventricle only needs to pump it to the lungs.
• What does the aorta do?

  It carries oxygenated blood to the body.
• What does the pulmonary artery do?

  It carries deoxygenated blood to the lungs.
• What does the pulmonary vein do?

  Carries oxygenated blood from the lungs to the heart.
• What does the superior vena cava do?

  Collects deoxygenated blood from organs above heart.
• What does the inferior vena cava do?

  It collects deoxygenated blood from organs below the heart.
• What does the septum do?

  Separates chambers.
• Draw and label a diagram of the heart.

  This is a diagram.

  
• What is a double circulatory system?

  A circulatory system in which blood passes through the heart twice in one complete circuit of the body. One side is oxygenated and the other side is deoxygenated.
• What is cardiac output?

  The volume of blood pushed into aorta per minute (litres/min).
• What is stroke volume?

  The volume of blood pushed into aorta in each beat (litres/beat).
• What is heart rate?

  The number of times the heart beats per minute (beats/min).
• How do you calculate cardiac output?

  Cardiac output = heart rate x stroke volume.