heart

• Circulatory system


  An example of an organ system whose role is to transport oxygen and nutrients to the body's tissues
• Circulatory system


  • Relies on 3 main things: blood, blood vessels, heart
• double circulatory system

  -two circuits joined together ( lungs / res of body)

  
  

  right ventricle pumps deoxygenated blood to the lungs to get oxygen. blood then returns to heart (first one)

  
  

  left ventricle pumps oxygenated blood around all the other organs of the body. the blood give up it oxygen at the body cells and deoxygenated blood returns to the heart to be pumped out to the lungs again (second one)
• Blood vessels


  Hold the blood
• Heart


  Pumps the blood to keep it moving through the vessels
• Path of blood through the heart

  1. Flows into right atrium and left atrium

  2. Flows from atria into ventricles

  3. Flows out of ventricles into pulmonary artery and aorta

  4. Cycle repeats around 70 times per minute
• Atria


  Top chambers of the heart
• Ventricles


  Bottom chambers of the heart
• Valves


  Prevent blood from flowing backwards, ensure blood flows in the right direction
• Pacemaker cells


  Produce electrical impulses to make the heart contract regularly

  -RIGHT ATRIUM
• artifical pace maker is used by people with heart falure
• Artery

  -Any vessel that carries blood away from the heart

  -high pressure

  -strong/ elastic walls

  -thick walls
• Vein

  • cary blood to heart
  • large lumen
• Coronary arteries


  Small arteries that branch off the aorta to supply the heart muscle with oxygenated blood