the lungs

• name the structure in the lungs where gas exchange takes place

  alveoli ( there are millions of these tiny air sacs in the lungs )
• how do u work out breathing rate?


  breathing rate = number of breaths / time
• explain how gas is exchanged between the lungs and blood that has just returned from the rest of the body.


  alveoli are surrounded by blood capillaries. blood that has just returned has a low oxygen concentration and a high co2 concentration. in alveoli, the oxygen concentration is high and the carbon dioxide concentration is low. oxygen diffuses out of the alveoli into the blood and co2 diffuses out of the blood into the alveoli
• parts of lungs:

  name them.

  A) trachea

  B) lung

  C) bronchus

  D) bronchiole

  E) alveoli

  F) blood capillaries

  G) diaphragm

  H) ribs

  I) intercostal muscles
• how do u calculate breathing rate?

  breaths per minute = number of breaths / number of minuted