Mammalian Heart

• Vertical Section through a Human Heart

  A) Vena Cava

  B) right atrium

  C) semi lunar Valves

  D) Vena Cava

  E) Tricuspid Valve

  F) right ventricle

  G) septum

  H) left ventricle

  I) valve tendons

  J) left atrium

  K) pulmonary vein

  L) left lung

  M) pulmonary artery

  N) left lung

  O) aorta

  
• The Mammalian Heart

  A) superior vena cava

  B) right pulmonary artery

  C) right pulmonary vein

  D) right atrium

  E) coronary arteries

  F) inferior vena cava

  G) right ventricle

  H) left ventricle

  I) left pulmonary vein

  J) left atrium

  K) left pulmonary artery

  L) aorta

  
• Heart

  • 3 tissue layers:
  • Epicardium (smooth outer)
  • Myocardium (thick cardiac muscular middle)
  • Endocardium (smooth heart chamber lining)
  • Aorta: Branch to head + down to body; largest artery
  • Pulmonary Arteries: 1 goes to L lung + other R
  • Vena Cavae: Superior vena cava brings deoxygenated from head + inferior up from body, to R atrium
  • Pulmonary Veins: Bring oxygenated blood to L atrium from lungs
  • Coronary Arteries: On heart surface
  • Aorta branch
  • Oxygenated blood to cardiac muscle (myocardium)

  Vertical Section

  • 4 chambers seen
  • Upper: R + L atria
  • Lower: R + L ventricles
  • Septum: Central cardiac muscle wall
  • Valves stop backflow
  • Atrioventricular (AV) valves between atria + ventricles
  • 2 semi-lunar valves in main arteries
  • Cordae tendonae (tendon cords) attach to AV valves + muscle pillars (papillary muscles) in ventricle wal
  • Stop valve inversion
  • Papillary muscles control tension