lungs

• what is the alveoli

  the site of gas exchange
• what is the epiglotis


  structure at the back of your throat which prevents you from swallowing while breathing
• what is the general structure of the lungs

  trachea > brochus > alveoli

  (diaphragm)
• what is the structure of the trachea

  rings of cartilage that do not reach the whole way around to allow for constriction/flexibility

  the inside is coated with goblet cells, ciliated epitheleal cells and smooth muscle
• what type of cells exist in the alevoli

  squamous epitheleal cells - 'squashed'