gas exchange in alveoli

• How are alveoli adapted for gas exchange?


  • large surface area

  • good blood supply

  • thin - short diffusion pathway

  • moist - dissolve gases
• what is meant by a surfactant


  this stops the alveoli from sticking together
• how does a surfuctant prevent the alveoli from sticking together


  it reduces surface tension
• what type of epithlium are the alveoli made out of


  squarmos epithilium
• what is the advantage of the avleoli being made of squarmos epithilium


  it allows the efficient exchange of gasses
• what does a micrograph of a bronchiole look like

  
• where is the lumen in a micrograph of a bronchiole


  the centre hole
• what surrounds the lumen in a bronchiole


  cilliated epithilium
• what does the cilliated epithilium contain why

  goblet cells to allow the secretion of mucus to make the bronchioles moist for gasses to dissolve