gas exchange Flashcards
what do alveoli give the lungs
a huge surface area
surface area of alveoli
50-80m2
why is the alveoli well supplied with blood vessels
continuos bloodflow helps keep differencce in concentration of o2 and co2 levels
why do they have a thin membrane
so gas molecules dont have far to travel
covered in a layer of what
moisture
what does moisture do
help gases diffuse
what are the 4 main points of alveloi gass exchange
- large surface area
- well supplied w/ blood
- thin walls
- moisture
blood has low or high oxyegn
low, used by body tissues
blood has high or low co2
high, product of respiration picked up from tissues
air has high or low o2
high
air has high or low co2
low
what is the concentration of gas exchange
difference in gasses between blood and air
what is the concentration gradient
high to low.
where is blood pumped from
pulmonary artery
wher is air entering
outside into lungs
