gas exchange in the lungz

Question 1

describe the process of air movement of air throughout your body?

Answer 1

air you breathe goes through trachea
trachea splits into 2 tubes called bronchi
bronchi later split into bronchioles
at the end of brioncholes there is tiny air sacs called alveoli

Question 2

how is alveoli adapted for gas exchange?

Answer 2

millions of alveoli mean lungs have a huge surface area
alveoli have very thin walls so diffusion path is very short
large blood supply which maintains a steep conc gradient

Question 3

describe the process of gas exchange at alveoli?

Answer 3

blood that passes alveoli has lots of co2 and little oxygen
oxygen from alveoli ( high conc) diffuses into bloodstream (low conc)
co2 from blood (high conc) diffuses into alveoli (low conc)