2.3 Lungs

• Diagram

  Label:

  A) Trachea

  B) Bronchi

  C) Bronchioles

  D) Alveoli

  E) Intercostal Muscles

  F) Diaphragm

  
• Alveoli Function

  • Tiny air sacs found in the lungs
  • Where oxygen and carbon dioxide move between the air and blood by diffusion
• Alveoli Adaptions

  • Large Surface Area (creates short diffusion pathway)
  • Good Blood Supply (surrounded by a network of capillaries)
  • Moist walls (enables gases to dissolve)
  • Well Ventilated
  • 1 Layer of thin cells (Increases diffusion rate)