Pulmonary Vs. Systemic

• Much lower pressure
• Much higher blood flow
• Vessels tends to be thin walled and lumen wider than systemic Vasculature
• Extrapulmonary
  • Main Pulmonary Artery long
  • As wide as Aorta
  • 60-75% thickness of Aorta
  • Bifurcates under Arch of Aorta
  • Interrupted fragments elastic laminae
• Intrapulmonary
  • Contours of elastic and muscualr arteries and arterioles