lungs

• Where are the lungs

  In the thorax

  Thorax is the top part of your body

  It is separated from the lower part of the body by the diaphragm

  Lungs are protected by the rib cage and surrounded by the plural membranes
• Alveoli


  Tiny sacs of lung tissue specialized for the movement of gases between air and blood

  Oxygen diffuses out of alveolus (high conc) into blood (low conc)

  Carbon dioxide diffuses out of blood into avleoli
• How are alveoli specialised

  -A large surface area

  -A moist lining for dissolving gases

  -Very thin walls

  -A good blood supply