Topic 2: Genes and Health Flash Cards

Topic 2

, What is gas exchange by diffusion
increased by ?




QUESTION




- Increase in surface area


-


Decrease in diffusion distance
V



-



Steeper diffusion gradient

7




ANSWER

, What is Fick's Law of diffusion ?




QUESTION




surface area x conc difference
rate of
.




&
diffusion distance




ANSWER

, How are the lungs adapted for rapid
gas exchange ?




QUESTION



·
They have a large surface area due to
presence
of many alveoli which increase surface area



·
Good supply of circulating blood to the lungs which

carries carbon dioxide to the lungs and oxygen

away from them ensures that the concentration

gradient is stepp


They have
·
short diffusion distance as alveoli is

o ne cell thick


ANSWER