Gas Exchange and Concentration Gradient Flashcards
0
Q
How is gas exchange achieved?
A
by diffusion, due to the concentration gradient
1
Q
how is the concentration gradient maintained?
A
- replacement of gases
- flow of blood
2
Q
WHy does oxygen move fmor the alvioli into blood?
A
high conc. of oxygen in alveili than plasma, therefor oxygen diffuses in
3
Q
why does co2 move form the blood into the alveilie
A
greater concentration of carbon dioxide in plasma
4
Q
Explain the movemnt of blood around
A
1) high o2 and low co2 blood moves into cappilaries around alveioli
2) alveioli difference in concentrations
3) therefor diffusion of moist layer
