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
, 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
