Heart

• circulatroy system - Made up of the heart and blood vessles.
• Heart has Muscular walls to pump blood
• • Left ventricle wall is thicker to pump blood at higher pressure because blood needs to be pumped up to the head, and all around the body.
• • Coronary arteries provide the heart muscle itself with a blood supply, providing the heart muscle cells with oxygen and glucose for respiration.
• Blood vessels carry blood away from the heart (arteries) or towards the heart (veins).
• Valves prevent backflow of blood, Keeping it moving from atria, to ventricles and out through the blood vessels.
• Artery - Carries blood away from the heart at high pressure. They are thick, muscular and small to keep blood at high pressure
• vien - Carries blood into the heart at low pressure. They have thinner walls and a larger lumen and have valves to prevent backflow
• Cappilary - Where oxyge nand nutrients diffuse from blood vessels to the body cells. one cell thick with a very small lumen to help with diffusion.
• The heart

  A) pulmonary capillary

  B) pulmonary vein

  C) aorta

  D) left atrium

  E) left ventricle

  F) arterial blood

  G) right ventricle

  H) right atrium

  I) pulmonary artery

  
• Statins - Long term medication that lowers blood cholesterol levels.
• High cholesterol increases risk of coronary heart disease because it builds up on the inside of arteries making them narrower and harder to pump blood through. This causes less oxygenated blood reaching vital organs like the brain and heart.
• Stents - a small metal mesh tube that is used to keep blood vessels open and allow blood to flow freely. (Inserted through surgery)
• where is the natural pace maker found

  right atrium
• which blood vessel carries deoxyganated blood away from the heart

  pulmonary artery = dexo away

  aorta = oxyg away

  
• Beta Blockers


  slow down the heart rate, reduce muscle tension, blood pressure and the effects of adrenaline.