exchanging substances Flashcards
1
Q
where does gas exchange happen in the body
A
happens in the lungs
2
Q
what is the job of the lungs
A
to transfer oxygen to the blood and to remove waste carbon dioxide
to do this the lungs contains millions of little air sacs called alveoli where gas exchange takes place
3
Q
what are the functions of the alveoli
A
an enormous surface area
a moist lining for dissolving gases
very thing walls
a good blood supply
4
Q
what is inside the small intestine
A
millions and millions of these tiny little projections called villi
5
Q
what do villi do
A
they increase the surface area in a big way so that digested food is absorbed much more quickly into the blood
6
Q
some features of the villi
A
a single layer of surface cells
a very good blood supply to assist quick absorbtion
