Circularity System

• What is a stent?

  A metal wire mesh that covers the lining inside the vessel and then a balloon is inflated to widen it and then deflated leaving the stent to allow blood to flow through.
• What is a statin?

  Medication that is prescribed to anyone who is at risk of cardiovascular disease and which lowers the cholesterol levels and therefore decreases the rate of fatty deposits that store inside the colonary artery.
• Name each part:

  4) Aorta

  5) Left Pulmonary Arteries

  6) Left pulmonary veins

  7) Left atrium

  10) Left Ventricle

  11) Septum

  13) Right ventricle

  16) Right atrium

  17) Right pulmonary veins

  18) Right pulmonary arteries

  19) Vena cava

  
• Advantages of mechanical valves?

  Lasts for a very long time.
• Disadvantages of mechanical valves?

  Must take medication for the rest of their life.
• Advantages of biological valves?

  They work really well and don't need any medication.
• Disadvantages of biological valves?

  Only last for 12-15 years.
• Disadvantage of pacemakers?

  Needs regular check-ups
• Structure of a vein?


  Valves - to prevent the backflow of blood

  Large lumen - to reduce resistance of blood travelling at a low pressure

  Thinner muscle fibre - as it's not needed at a low pressure
• Structure of an artery?

  Small lumen - to keep the blood at a high pressure

  Thick elastic tissue - to allow vessel to stretch and return back to shape.

  Muscle fibre - to keep the blood at a high pressure