Alveoli for Gas exchange

• Describe the function of the alveoli

  • Site of gas exchange
  • Takes in oxygen and takes out co2
• Adaptation of Alveoli

  • Larger surface area which mean more space for gas exchange
  • Thin walls mean shorter diffusion distance for rapid diffusion
  • Permeable so substance can move through
• Adaption for Alveoli

  • Moist which allows gases to dissolve and pass through
  • Surrounded by blood vessels mean many capillaries to allow easy gas exchange to maintain concentration gradient