module 3

• cilia are the hairs

  
• histology of trachea

  
• histology of bronchi

  
• what are the main feature of bronchioles?

  no cartilage and folded structure of muscles and elastic tissues
• what is the use of folded structure of muscle and elastic tissues and where is it?

  in the bronchioles,
• what is the use of folded structure of muscle and elastic tissues and where is it?

  in the bronchioles

  gives surface area for expansion when breathing in
• adaptation of trachea: C-shaped cartilage which gives gallet room to expand for food to pass down
• lungs are in thorax
• goblet + ciliated cells produce mucus which traps pathogens and bacteria. Cilia moves away from lungs
•  trachea:

  Cartilage✔ 

  Goblet cell ✔ 

  Elastic fibers ✔ 
•  

  bronchi:

  Cartilage✔ 

  Goblet cell ✔ 

  Elastic fibers ✔ 
• bronchiole:

  Cartilage✔/✘ 

  Goblet cell ✔ 

  Elastic fibers ✘ 
• alveoli:

  Cartilage✘ 

  Goblet cell ✔ 

  Elastic fibers ✘