cv (heart)

• heart - the size of a fist that pumps blood
• atrioventricular node - sends impulses to the ventricles
• tricuspid valve - the valve between the right atrium and right ventricle
• mitral valve - the valve between the left atrium and left ventricle
• semilunar valves - prevent backflow of blood into the left ventricle
• atrioventricular valves - separate the atria from the ventricles and prevent backflow during systole
• aortic valve - connects left ventricle and aorta (controls blood flow out from the heart)
• pulmonary valve - controls blood flow from the right ventricle to the lungs
• heart sounds - noises that occur when blood flows through the heart
• s1 - "lub" mitral and tricuspid valves closing
• s2 - "dub" aortic and pulmonary veins closing (relaxation of ventricles)
• s3 - needs a huge pump of the blood
• s4 - "heart murmur" the heart sound is not lub-dub, the heart has an abnormal functioning
• sinoatrial node - initiates the electrical signal
• atrioventricular node - the point where the electrical impulses from the atria and ventricles meet
• bundle branches - send electric impulses to the ventricles from the atria
• bundle of his - transmit the electrical impulse from the av node to the purkinje fibers
• purkinje fibers - distributes electrical impulses to the ventricles
• valves:

  atrioventricular valves

  semilunar valves
• atrioventricular valves:

  tricuspid valve

  mitral valve
• semilunar valves:

  aortic valve

  pulmonary valve
• conduction system:

  sinoatrial node

  atrioventricular node

  bundle branches

  bundle of his

  purkinje fibers
• heart - about the size of a fist that pumps blood
• blood flow of deoxygenated blood:

  • superior and inferior vena cava
  • right atrium
  • tricuspid valve
  • right ventricle
  • pulmonary valve
  • pulmonary arteries
• blood flow of oxygenated blood:

  • pulmonary veins
  • left atrium
  • mitral valve
  • left ventricle
  • aortic valve
  • aorta