Site of Highest Resistance

• Site of Highest Resistance:

  • Trachea and main airways large calibre
  • Low resistance
  • Highest resistance in airways 7 - 13 th generation (small in calibre)
  • 72 branches per generation (few)
  • Smooth muscle + +
  • High level ANS innervation (alters calibre)
  • 14th generation onwards
  • Although small in calibre, theres 1 million branches per generation
  • Huge cross sectional area
• Site of Highest Resistance - Trachea and main airways:

  • large in calibre
  • Low in resistance
• Site of Highest Resistance - 7th to 13th generation:

  • Highest resistance in airways (small in calibre)
  • 72 branches per generation (few)
  • Smooth muscle + +
  • High level ANS innervation (alters calibre)
• Site of Highest Resistance - 14th generation onwards:

  • Although small in calibre, theres 1 million branches per generation
  • Huge cross sectional area