gas exchange

Question 1

what is constantly being supplied and removed

Answer 1

oxygen and carbon dioxide

Question 2

how think is the lining of the aveoli and why

Answer 2

-one cell thick for short diffusion spaces for oxygen that u breathe in

-this then is the same for the blood capillary, the oxygen then diffuses into the bloodstream and binds to rbc

Question 4

how does co2 get out

Answer 4

-diffuses out of the capillary and into the aveoli where it is breathed out

Question 5

how do you keep the same concentration gradient?

Answer 5

-because oxygen is also being taken away from the area through blood flow as well as being constantly supplied in the Aveola

-so there’s always oxygen in the alveoli but not always in the bloodstream-high to low

Question 6

what are important features of the Aveoli

Answer 6

-large SA

-very thin- shirt diffusion distance

-moist lining- allow gassed to dissolve and diffuse

-good blood supply- maintains conc gradient

-good ventilation-through breathing