chapter 11.2 gas exchange
concentration gradient -✔✔allows net diffusion in a certain direction
limewater-✔✔to test for CO2, if present turns into milky white
respiration -✔✔O2 is used CO2 is formed, therefore expired air has less
O2 and more CO2 than inspired air
O2 IN-✔✔21
O2 OUT-✔✔16
CO2 IN-✔✔0.04
CO2 OUT-✔✔4
features of gas exchange surfaces-✔✔large SA for diffusion
most SA to dissolve gasses
thin SA - 1 cell thick
good blood supply to maintain concentration gradient
gas exchange at alveolus-✔✔O2 dissolves in the water lining in each
alveolus
then diffuses through the wall of the alveolus
then through the capillary wall into the blood
although it diffuses through two cells, the distance is very small.
concentration gradient -✔✔allows net diffusion in a certain direction
limewater-✔✔to test for CO2, if present turns into milky white
respiration -✔✔O2 is used CO2 is formed, therefore expired air has less
O2 and more CO2 than inspired air
O2 IN-✔✔21
O2 OUT-✔✔16
CO2 IN-✔✔0.04
CO2 OUT-✔✔4
features of gas exchange surfaces-✔✔large SA for diffusion
most SA to dissolve gasses
thin SA - 1 cell thick
good blood supply to maintain concentration gradient
gas exchange at alveolus-✔✔O2 dissolves in the water lining in each
alveolus
then diffuses through the wall of the alveolus
then through the capillary wall into the blood
although it diffuses through two cells, the distance is very small.
